Answers
Answer:
A. 131.9 s
B. 0.13 m/s
Explanation:
From the question given above, the following data were obtained:
Mass (m) = 490 Kg
Height (h) = 17 m
Power (P) = 0.83 hp
Time (t) =?
Velocity (v) =.?
Next, we shall convert 0.83 hp to Watts. This can be obtained as follow:
1 hp = 745.7 Watts
Therefore,
0.83 hp = 0.83 hp × 745.7 Watts / 1 hp
0.83 hp = 618.931 Watts
Thus, 0.83 hp is equivalent to 618.931 Watts.
A. Determination of the time.
Mass (m) = 490 Kg
Height (h) = 17 m
Power (P) = 618.931 Watts
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =?
Power = Energy / time
P = mgh / t
618.931 = 490 × 9.8 × 17 / t
618.931 = 81634 / t
Cross multiply
618.931 × t = 81634
Divide both side by 618.931
t = 81634 / 618.931
t = 131.9 s
Therefore, it will take 131.9 s to lift the beam.
B. Determination of the constant velocity.
We'll begin by calculating the force. This can be obtained as follow:
Mass (m) = 490 Kg
Acceleration due to gravity (g) = 9.8 m/s²
Force (F) =?
Force = mass × acceleration
Force = 490 × 9.8
Force = 4802 N
Finally, we shall determine the constant velocity as follow:
Force (F) = 4802 N
Power (P) = 618.931 Watts
Velocity (v) =?
P = F × v
618.931 = 4802 × v
Divide both side by 4802
v = 618.931 / 4802
v = 0.13 m/s
Thus, the constant speed at which the beam moves upward is 0.13 m/s
Related Questions
If a missile is launched from the equator toward an object in the Northern Hemisphere, should it be aimed to the left, to the right, or directly at its target? Why?
Answers
Answer:
Must be aimed to the left
Explanation:
Coriolis effect deflects wind or any moving item which has no contact with earth and has substantial distance to cover and moving at a substantial altitude. Coriolis effect deflectd the object to the right in the northern hemisphere. Therefore, missile must be aimed to the left, to nullify the coriollis effect.
Help plz!! I’ll give brainlist!! I need it fast plz
Answers
Answer:
1.A
2.E
3.C
4.i think A
Explanation:
2. E
3. B
4. D
the horizontal is on the left.
vertical is on the right.
for number one it says where was the speed zero? look at the line, A is at the bottom and horizontal is there.
same applies to the vertical which you get the answer E
Tom skis at an average speed of 5 m/s. How many mins does it take for Tom to ski 4050 m.
Answers
Divide 4050 by 5 to get 810
find the factor of the number 1.30
Answers
1 3/10 because 130 is greater than 100 we have simplified this fraction even further to a mixed fraction.
Please provide positive integer to calculate.
When you walk into a dark room and turn the light on, do the electrons travel all the way from the switch to the light?
Answers
Answer:
Yes
Explanation:
This is because for the light to come on, electric current has to flow through it which is due to electron motion. As the electrons move through the light, it turns electrical energy to light energy, so the light comes on.
An inclined plane is set at an angle of 29 degrees above horizontalWhat is the acceleration of a 420 g block of ice sliding down the inclined plane? Assume no friction
Answers
The net force parallel to the plane is
∑ F = m g sin(29°) = m a
where
m = mass of the block
g = magnitude of the acceleration due to gravity, 9.8 m/s²
a = mag. of acceleration of the block
where we take the direction of the block's sliding down the plane to be positive. Then
a = g sin(29°) ≈ 4.8 m/s²
Distance is a __________ quantity, as it has no direction, only magnitude
Answers
Answer:
-scalar
Explanation:
-A scalar is any quantity that has a magnitude, but no direction
-quantities with no specified direction.
hope it helps:)
A test pilot flies with an acceleration of 5 g. What is his acceleration in meters
per second squared?
A. 5 m/s2
B. 9.8 m/s2
C. 49 m/s2
D. 14.8 m/s2
Answers
Answer:
C. 49 m/s^2
Explanation:
1 G = 9.81 m/s^2
so 5 * 9.81 = 49.05
or C. 49 m/s^2
8 A small smooth object slides from rest down a smooth inclined plane inclined at
30° to the horizontal. What is (i) the acceleration down the plane, (ii) the time
to reach the bottom if the plane is 5 m long?
The object is now thrown up the plane with an initial velocity of 15 ms -1.
(iii) How long does the object take to come to rest? (iv) How far up the plane has
the object then travelled?
Answers
Answer:
(i) The acceleration of the object down the plane is approximately 4.9 m/s²
(ii) The time it takes for the object to reach the bottom is approximately [tex]1.\overline{428571}[/tex] seconds
(iii) The time it takes the object to come to rest is approximately 1.030636 seconds
(iv) The object has travelled past the top of the plane by time it comes to rest
Explanation:
(i) The given parameter for the objects motion are;
The angle of inclination of the plane with the horizontal, θ = 30°
The length of the plane, s = 5 m
Let "a" represent the acceleration down an inclined plane, due to the acceleration under gravity "g" we have;
a = g × sin(θ)
Where;
g = The acceleration due to gravity ≈ 9.8 m/s²
∴ a ≈ 9.8 m/s² × sin(30°) = 9.8 m/s² × 0.5 = 4.9 m/s²
The acceleration of the object down the plane, a ≈ 4.9 m/s²
(ii) The time it takes for the object to reach the bottom, can be found from the following kinematic equation of motion;
s = u·t + 1/2·a·t²
Where;
s = The length of the inclined plane = 5 m
u = The initial velocity of the object = 0 m/s
t = The time of motion of the object (Here the time to reach the bottom of the plane)
a = The acceleration of the object = 4.9 m/s²
Therefore, we have;
5 = 0 × t + 1/2 × 4.9 × t² = 2.45·t²
t² = 5/2.45 = 100/49
t = √(100/49) = 10/7 = [tex]1.\overline{428571}[/tex]
The time to reach the bottom of the plane = t = [tex]1.\overline{428571}[/tex] seconds
(iii) When the object is thrown up the plane with an initial velocity of 15 m/s, the time, "t", it takes the object to come to rest is found by the following kinematic equation of motion;
v² = u² - 2·a·s
Therefore, we have;
v² = 15² - 2 × 4.9 × 5 = 176
v = √176 = 4·√11
The velocity of the object at the top of the plane = v = 4·√11 m/s
The time it takes the object to come to rest after reaching the top of the plane = The time it takes the object (projectile) to reach maximum height
[tex]t_m = \dfrac{v_i \cdot sin(\theta _i )}{g}[/tex]
Where;
[tex]t_m[/tex] = The time it takes the object to reach maximum height
[tex]v_i[/tex] = The initial velocity of the object at the top of the inclined plane = 4·√11 m/s
[tex]\theta _i[/tex] = The initial angle of inclination of the path of the object with the horizontal = 30°
Therefore, we have;
[tex]t_m = \dfrac{4 \times \sqrt{11} \times sin(30^{\circ} )}{9.8} = \dfrac{10 \cdot \sqrt{11} }{49} \approx 0.67686[/tex]
The time it takes the object to come to rest after reaching the top of the plane = The time it takes the object to reach maximum height = [tex]t_m[/tex] ≈ 0.67686 seconds
The time it takes the object to reach the top of the plane, [tex]t_{top}[/tex], is given from the kinematic equation of motion, v = u - a·t, as follows
v = u - a·t
∴ t = (u - v)/a
[tex]t_{top}[/tex] = (15 - 4·√11)/4.9 ≈ 0.353776
The time it takes the object to reach the top of the plane = [tex]t_{top}[/tex] ≈ 0.353776 s
The total time it takes the object to come to rest, ∑t = [tex]t_m[/tex] + [tex]t_{top}[/tex]
∴ ∑t ≈ 0.67686 + 0.353776 = 1.030636
The time it takes the object to come to rest = ∑t ≈ 1.030636 seconds
(iv) The distance up the plane the object reaches, "s", is given by the following kinematic equation;
s = u·t - 1/2·a·t²
Therefore, we have;
s = 15 × 15/4.9 - 1/2 × 4.9 × (15/4.9)² ≈ 22.959 m
However, the plane is 5 meters long, therefore, the object goes further than the top of the plane.
When a wave strikes and object and bounces off . ( example echo)
A. Medium
B. Refraction
C.Reflection
D. Interference
Answers
Answer:
C. reflection
Explanation:
reflection occurs when a wave strikes an object and bounces off of it
When a wave strikes an object and bounces off, it is called reflection.
Hence, the correct option is C.
This is similar to what happens when sound waves strike a surface and bounce back, resulting in an echo.
Reflection occurs when a wave encounters a boundary or an obstacle and changes direction, returning back into the medium it came from.
The angle of incidence (the angle at which the wave strikes the surface) is equal to the angle of reflection (the angle at which the wave bounces off the surface).
Therefore, When a wave strikes an object and bounces off, it is called reflection.
Hence, the correct option is C.
To know more about reflection here
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The human body can store excess animo acids as a protein source ?
Answers
Answer:
The thermic effect (TEF) is greater for protein compared to carbohydrate and fat. The body can store excess amino acids for later use. The protein-sparing effect spares the utilization of protein as an energy source and allows it to be used for more important metabolic functions.
How would the gravitational force between the earth and the moon change if the moon had half the mass?
Answers
The moon's gravity, combined with the waltz of Earth and the moon around their center of mass, forces the oceans into an oval shape, with two simultaneous high tides. ... If the moon were half its mass, then the ocean tides would have been correspondingly smaller and imparted less energy to it.
Question 2 (2 points)
Which of the following is a true statement about mass and weight? (2 points)
a
Mass is a measure of how much matter an object has, while weight is a measure of
how much space the object takes up.
Mass will not change based on location, while weight will change based on
gravitational pull
b
Mass is a measure of a gravitational pull on an object, while weight is a measure of
how much matter is an object has,
Mass is proportional to the force of gravity, while weight is proportional to the
amount of mass,
d
Answers
Answer:
B. Mass will not change based on location, while weight will change based on gravitational pull.
Answer:
B
Explanation:
took the test
A boy pushed horizontally a 3.5 kg plastic chair across the slippery floor. If
the acceleration of the plastic chair is 2.2 m/s2 to the left, what is the net force
exerted on the plastic chair?
Answers
Answer:
7.7 N to left or -7.7 N
Explanation:
slippery floor means no frictional force
Equation for force
F = m * a , where F is force, m is mass in kg, and a is acceleration in m/s²
F = 3.5 * -2.2 m/s² = -7.7 N
Which of the following best explains why the noble gases are less likely to chemically
bond with other elements?
A They are all non-metals. |
B They are all rare elements.
C They all have a full outer shell of electrons.
D They have the highest atomic number in the row.
Answers
Answer:
a
Explanation:
3. Electrons are the only part of an atom that can be transferred between materials. True or
False?
Answers
Answer:
True
Explanation:
Electrons can be transferred between materials as in chemical reactions solid substances lose electrons while other elements gain electrons to balance the electrons in reaction.It occurs by conduction,polarization and friction.
Write a sentence on how these words are used in real life situations
1. Average Velocity
2. Instantaneous Velocity
3. Acceleration
Answers
Answer:
Explanation:
You can approach an expression for the instantaneous velocity at any point on the path by taking the limit as the time interval gets smaller and smaller. Such a limiting process is called a derivative and the instantaneous velocity can be defined as.#3
For the special case of straight line motion in the x direction, the average velocity takes the form: If the beginning and ending velocities for this motion are known, and the acceleration is constant, the average velocity can also be expressed as For this special case, these expressions give the same result. Example for non-constant acceleration#1
terms involved in s=ut+1/2at^2
Answers
Explanation:
The terms involved in S = ut + 1/2at²
S = displacement
u = initial velocity
a = acceleration
t = time.
Hope it will help :)
Answer:
the distance traveled or displacement (s) of an object using its initial velocity (u), acceleration (a), and time (t) traveled.
a 20 of of ice at 0c is dropped into water at boiling point, specific heat capacity of water =4200 J/kg•c, sepesific latent heat of fusion (Lf) =3.3x10^(5) J/kg calculate the amount of heat energy needed to complete the previous conversion
Answers
Answer:
15 KJ
Explanation:
The quantity of heat (Q) required is given as:
Q = mcΔθ + mL
where m is the mass of ice, c is its specific heat capacity, L is its specific latent heat andΔθ is the change in temperature.
Given: m = 20g, temperature of ice = 0[tex]^{o} C[/tex], specific heat capacity of water = 4200 J/kg[tex]^{o} C[/tex], latent heat of fusion of ice = 3.3 x 10^(5) J/kg, temperature of water = 100[tex]^{o} C[/tex].
Q = m (cΔθ + L)
= 0.02(4200 x (100) + 330000)
= 0.02(420000 + 330000)
= 0.02 (750000)
Q = 15000
Q = 15000 Joules
Q = 15KJ
The quantity of heat needed to complete the conversion is 15 KJ.
During a goal-line stand, a 112-kg fullback moving eastward with a speed of 6 m/s
collides head-on with a 120-kg lineman moving westward with a speed of 8 m/s.
The two players collide and stick together, moving at the same velocity after the
collision. Determine the post-collision velocity of the two players.
Answers
Answer:
-1.24 m/s
Explanation:
Total momentum before collision = total momentum after collision
Total momentum before collision = (mass of full back * velocity of fullback) + (mass of lineman * velocity of line man).
Mass of full back = 112 kg, mass of line bag = 120 kg, velocity of full back 6 m/s (east), velocity of line back = -8 m/s (west). Hence:
Total momentum before collision = (112 * 6) + (120 * -8) = 672 - 960 = -288 kgm/s
The total momentum after collision = (mass of full back + mass of line back) * velocity after collision.
Let velocity after collision be v, hence:
The total momentum after collision = (112 + 120)v = 232v
Total momentum before collision = total momentum after collision
-288 = 232v
v = -288 / 232
v = -1.24 m/s
Therefore after collision, the two players would move at a velocity 1.24 m/s west (the same direction as the lineman).
How many newtons is the force of gravity g , acting on an apple with mass m = 200 g?
Answers
Answer:
Mass of the apple is 200g or 0.2 kg
Force acting on it will be,
Force= Mass× acceleration due to gravity
Force= 0.2×9.8 Newton= 1.96 Newton
Answer:
2 N
Explanation:
The question requires you to express the weight of the apple into Newton
1 kg = 10 N
200g = 200/1000 = 0.2 kg
1 kg = 10 N
0.2 kg = ?
0.2 * 10 = 2 N
An angle of refraction is the angle between the refracted ray and the
o incident ray.
o normal.
O medium.
O boundary
Answers
Answer:
b) normal
Explanation:
The angle of refraction (transmission) Θt is the angle between the refracted ray and the normal N'. 2. When a light ray hits a surface normally, the angle between the incident ray and the normal is 0, so Θi = 0. Since the angle of reflection equals the angle of incidence, Θr= 0.
The angle of refraction is the angle between the refracted ray and the normal, which is option B.
What is the angle of refraction?When light travels from one medium to another medium with a different refractive index, it changes direction.
The angle of refraction is the angle between the refracted ray and the normal, which is an imaginary line perpendicular to the boundary between the two media at the point of incidence. The incident ray is the incoming ray of light that strikes the boundary between the two media.
The medium refers to the substance through which light is passing, and the boundary is the surface separating the two media.
However, the angle of refraction is not related to the incident ray or the boundary, but rather the norm.
Thus, the correct answer would be an option (B) normal.
To learn more about the angle of refraction click here:
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How would the gravitational force between the earth and the moon change if the moon had twice the mass?
Answers
Explanation: The moon's gravity, combined with the waltz of Earth and the moon around their center of mass, forces the oceans into an oval shape, with two simultaneous high tides. ... If the moon were half its mass, then the ocean tides would have been correspondingly smaller and imparted less energy to it.
All sound waves need a(n) _______________________________________ to travel through. 4. _____________________ and ___________________ can be used to describe a sound wave.
Answers
Answer:
Material medium
compressions and rarefactions
Explanation:
A sound wave is an example of a mechanical wave. All mechanical waves require a material medium for propagation. The medium for the propagation of sound is air. This is the reason why, if you cover your mouth, it will be difficult for another person to hear whatever you are saying.
Sound is also a longitudinal wave. Longitudinal waves are described in terms of compressions and rarefactions. Compressions refer to areas where air molecules crowd together while rarefactions refer to areas where the air molecules spread out.
I feel death among us
Answers
same but who knows how 2021 might go
Answer:
same....
Explanation:
Wanna be friends?
Adjetivo utilizado para calificar la componente de la aceleración en la dirección del movimiento de un punto que se mueve según una circunferencia.
10 letras
Answers
Answer:
Tangencial.
Explanation:
El adjetivo empleado es tangencial, cuya longitud es diez caracteres. La aceleración tangencial es el componente del vector aceleración que es paralelo a la dirección del vector velocidad de un punto que se mueve sobre una circunferencia.
La aceleración tangencial tiene la función de cambiar la magnitud del vector aceleración.
Two positive charges 12×10^-6C and 8×10^-6 are 10cm apart. Find the workdone in bringing them 4cm together
Answers
Answer:
W = 5.76 J
Explanation:
Given that,
Charge 1, [tex]q_1=12\times 10^{-6}\ C[/tex]
Charge 2, [tex]q_2=8\times 10^{-6}\ C[/tex]
The distance between charges is 10 cm.
Initial distance = 10 cm = 0.1 m
Final distance = 10 cm - 4 cm = 6 cm = 0.06 m
We need to find the work done in bringing the 4 cm together.
We know that,
Work done = change in kinetic energy
[tex]W=kq_1q_2(\dfrac{1}{r_2}-\dfrac{1}{r_1})\\\\\text{Put all the values}\\\\W=9\times 10^9\times 12\times 10^{-6}\times 8\times 10^{-6}(\dfrac{1}{0.06}-\dfrac{1}{0.1})\\\\W=5.76\ J[/tex]
So, the required work done is 5.76 J.
You drop a bowling ball and it falls with an acceleration of 10 m/s2. The ball has a mass of 5 kg. How much force is causing the ball to fall?
Answers
Explanation:
Given
acceleration (a) = 10 m/s²
mass (m) = 5 kg
Force (F) = ?
We know
F = m * a
= 5 * 10
= 50 Newton
The force is 50 N
Hope it will help :)
Answer:
[tex]\boxed {\boxed {\sf 50 \ Newtons }}[/tex]
Explanation:
Force can be found using the following formula.
[tex]F=m*a[/tex]
where F is the force, m is the mass, and a is the acceleration.
1. Define Values
We know the acceleration of the bowling ball is 10 m/s² and the mass is 5 kilograms.
[tex]a= 10 \ m/s^2 \\m= 5 \ kg[/tex]
2. Calculate Force
Substitute the values into the formula.
[tex]F= 5 \ kg * 10 \ m/s^2[/tex]
Multiply.
[tex]F= 50 \ kg*m/s^2[/tex]
1 kilogram meter per square second is equal to 1 Newton. Our answer of 50 kg*m/s² is equal to 50 N[tex]F=50 \ N[/tex]
The force causing the ball to fall is 50 Newtons
Pls help I think it's pretty easy
Electromagnetic waves transfer energy and are produced by _____.
Answers
A rocket travels 200,000 meters in a time of 4.40 seconds . what of the speed of the rocket ?
Answers
Answer:
the speed of the rocket is 45454.5455
Explanation: Because the speed formula is basically just distance/ divided by time all you need to do is divide 200,000 meters by 4.40 seconds. And then thus you will get the speed.
Answer:
45454.55 m/s
Explanation:
[tex]S=\frac{d}{t}[/tex]
= [tex]\\S=\frac{200000}{4.40}[/tex]
=45454.55 m/s