Answer:
430 J6.26 m/sExplanation:
A. The kinetic energy is the same as the initial potential energy:
PE = mgh = (215 N)(2.0 M) = 430 J
__
B. The velocity achieved by falling from a height h is given by ...
v = √(2gh)
v = √(2·9.8 m/s^2·2 m) = √(39.2 m^2/s^2)
v ≈ 6.26 m/s
A block sits on a frictionless sheet of ice. When it is pushed by a force of 15 N, the block will accelerate at a rate of 6.4 m/s^2. The block is then moved to the moon, where the acceleration of gravity is 1.62m/s^2. The coefficient of kinetic friction between the block and the moon's surface is 0.35. If the block is now pushed with the same force, what will be its acceleration?
Answer:
[tex]a_{moon}=5.84m/s^{2}[/tex]
Explanation:
In order to solve this problem, we will need to draw a free body diagram of both situations (see attached picture).
So first, we need to find what the mass of the object is. We can do so by analyzing the horizontal movement of the first situation, so we get:
[tex]\sum F_{x}=ma[/tex]
F=ma
[tex]m=\frac{F}{a}[/tex]
so
[tex]m=\frac{15N}{6.4m\s^{2}}[/tex]
m=2.34kg
next, we can analyze the second situation, we will start by analizing the vertical movement so we can determine the Normal force, so we get:
[tex]\sum F_{y}=0[/tex]
[tex]N-W=0[/tex]
N=W
N=mg
[tex]N=2.34kg(1.62 m/s^{2}[/tex]
N=3.79N
so now we can analyze the horizontal movement of the block, so we get:
[tex]\sum F_{x}=ma[/tex]
[tex]F-N\mu _{k}=ma[/tex]
[tex]a=\frac{F-N\mu_{k}}{m}[/tex]
[tex]a=\frac{15N-(3.79N)(0.35)}{2.34kg}[/tex]
[tex]a=5.84 m/s^{2}[/tex]
what yall noticed about this picture please help me out
Answer:
theres a mouse lol
no
the occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud, accompanied by a bright flash and typically also thunder.
Explanation:
1. What coefficients would balance the following equation?
_Al + _02 →_Al2O3
2A1 + 302 +1A1,03
2A1+ 302 → 2A1203
3A1 + 302 + 2A1003
4A1 + 302 → 2A1203
Answer:
D. 4Al + 3O2 → 2Al2O3
Explanation:
Chemical reactions involves the chemical combination of two or more substances called REACTANTS to yield other substances called PRODUCTS. However, in accordance with the LAW OF CONSERVATION OF MASS, the amount of reactants must be equal to that of the products.
To accomplish this, the reaction must be BALANCED. A balanced equation is an equation in which the number of atoms of each element in the reactant side equals the number of atoms in the product side. In this reaction involving Aluminum and Oxygen to give Aluminum oxide as follows:
Al + 02 → Al2O3
A coefficient is used to balance the number of atoms on both sides of the equation as follows:
4Al + 3O2 → 2Al2O3
Answer:
here for points
3u3784y297y4ui3t7
Explanation:
Help please, need awsnser ASAP!
Mars has a thin atmosphere.
If B vectos, is added A vectos under a what
condition does the resultont vectos have a
magnitude equal to the A+B?
Answer:
when A and B are travelling opposite directions
question below
image below vvvvvv firsts gets brainiest
Answer:
4-12x
Explanation:
Please mark brainiest
Anna is drinking a glass of water in her kitchen. The water is too warm for Anna so she decides to make it colder by adding ice. Which statement describes why the ice cubes will melt?
A. Liquid water is reacting with solid water to absorb energy.
B. Water is evaporating from the surface of the water.
C. Slow-moving molecules move out of the ice.
D. Heat from the water moves into the ice.
Answer:
D: Heat from the water moves into the ice
Answer:
D
Explanation:
Because the molecules of a solid is going to separate form each other because of the hotness of the water and then that’s how the ice cubes would melt
if the angular diameter of an object is 15 arc seconds and it is 1.4 billion kilometers away, how big is its physical size?
the actual diameter of the object is 1.017×10⁵km
actual diameter, d = any line segment that passes through the center of the circle
angular diameter, θ = the angle that an actual diameter of an object makes.
distance, D= the actual path travel
distance of the object ,D= 1.4 billion = 1.4×10⁹km
angular diameter of an object,θ = 15arc
θ = 15 ×π/ (60×60×180) rad
[ ∵ 1 revolution = 2π = 360°×60×60]
Using the relation,
θ = d/D {angular diameter = actual diameter/ distance}
d = θD
d = 1.4×10⁹×[15×3.14/(60×60×180) ] km
= 1.017×10⁵km
This shows the actual diameter of the object is 1.017×10⁵km
It is the physical size of object.
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please help me will mark u brainiest
Answer:
Answer is A :)))))))))
A hammer strikes a nail with a 8 N force for 0.018 seconds. Calculate the impulse of the hammer.
Answer:
0.144
Explanation:
Impulse is defined as force multiplied by time
please mark me brainliest
An escalator is 17.4 m long. If a person stands on the escalator, it takes 47.6 s to ride from the bottom to the top. If a person walks up the moving escalator with a speed of 0.541 m/s relative to the escalator, how long does it take the person to get to the top?
Answer:
19.1 secs
Explanation:
The first step is to calculate the velocity
= 17.4/47.6
= 0.37 m/s
Therefore the time taken for the person to reach the top can be calculated as follows
= 17.4/(0.37+0.541)
= 17.4 / 0.911
= 19.1 secs
Hence the time taken is 19.1 secs
M A 40.0- cm-diameter circular loop is rotated in a uniform electric field until the position of maximum electric flux is found. The flux in this position is measured to be 5.20 × 10⁵N . m²/C. What is the magnitude of the electric field?
By electric flux, the electric field is 41.36 x 10⁵ N/C
We need to know about electric flux to solve this problem. Electric flux is the measure of the electric field through a given surface, although an electric field in itself cannot flow. It can be determined as
Φ = E . S = E . Scosθ
where Φ is electric flux, E is electric field, θ is angle of surface and S is surface area.
From the question above, we know that
Φ = 5.20 × 10⁵ N.m²/C
d = 0.4 m²
r = 0.2 m²
because of maximum flux, hence (cosθ = 1)
By substituting the following parameter, we get
Φ = E . Scosθ
5.20 × 10⁵ =E . π.r²
5.20 × 10⁵ =E . π.0.2²
E = 41.36 x 10⁵ N/C
Hence, the electric field is 41.36 x 10⁵ N/C
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Scientists study how the continents move. Why might scientists use a model
to show this movement?
O A. It is too slow to observe directly.
O B. It is too fast to observe directly.
O C. It is too dangerous to observe directly.
O D. It is too complex to observe directly.
Answer: A
Explanation: continents move very slowly, about one inch per year
Answer:
A
Explanation:
it takes thousands of years to see the continents progress in it's movement. by the time we see progress of how they are moving you'd have been dead for 50000 years XD
The alpha decay of radon-198
An airfoil is deflected upward as the airflow is deflected downward. Which of Newton's laws does this example best illustrate?
I will ask again. PLEASE HELP ME! I'M BEGGING! PLEASE HELP! Using what you have learned about energy conversions, describe the energy transfer or transformation for each of the following items:
a. Clapping your hands
b. Turning on a light
Answer:
A) Mechanical energy is converted into sound and thermal energy when the hands make contact
B) Mechanical Energy used to flip the switch sets off the lever which converts into Electrical Energy. Once the light is turned on, the Electrical Energy is converted into thermal energy, light energy, and a little bit of sound energy.
If the radius of an atom is 60 pm and the radius of the Earth is 6000 km, by how many orders of
magnitude is the radius of the Earth larger than an atom?
Answer:
1 x 10¹⁷
Explanation:
Given data:
Radius of the earth = 6000km
Radius of an atom = 60pm
Now, how many orders is the radius of the earth larger than an atom
Solution:
To solve this problem, let us express both quantity as the same unit;
1000m = 1km
6000km = 6000 x 10³m = 6 x 10⁶m
60pm;
1 x 10⁻¹²m = 1pm
60pm = 60 x 1 x 10⁻¹²m = 6 x 10⁻¹¹m
Now;
The order: [tex]\frac{6 x 10^{6} }{6 x 10^{-11} }[/tex] = 1 x 10¹⁷
Um avião, após deslocar-se 120 km para nordeste (NE), desloca-se 160 km para sudeste (SE). Sendo um quarto de hora o tempo total dessa viagem, o módulo da velocidade vetorial média do avião, nesse tempo, foi de A) 320 km/h. B) 480 km/h. C) 540 km/h. D) 640 km/h. E) 800 km/h.
Answer:
E) 800 km/h
Explanation:
The computation of the average vector velocity module of the plane, at that time is shown below:
The displacement vector is
d^2 = d1^2 + d2^2
where,
d1 = northeast displacement
d2 = southeast displacement
Now
d^2 = (120)^2 + (160)^2
= 14400 + 2560
= 40000
= √40000
d = 200 km
Now the average velocity is
V = ΔS ÷ Δt
= 200 ÷ 1 ÷ 4
= 200 × 4
= 800 km/h
How much momentum does a stationary 5500 kg mass have?
Answer:0
Explanation:
All stationary objects have no momentum they do not have any motion to have momentum you need mass and motion
Suppose the acceleration of an elevator is 1/2 g upward, then what is the reading on the scale in the elevator.
a. 1/2 mg
b. 2 mg
c. 3/2 mg
d. m
Answer:
c. 3/2 mg
Explanation:
Given that the acceleration of an elevator is 1/2 g upward.
The reading on the scale of the elevator is the net external force acting on the elevator.
Let the force F acting on the elevator as shown,
By using Newton's 2nd law, [tex]F_{net}=ma[/tex]
where, [tex]F_{net}[/tex] is the net force acting on the elevator.
m is the mass of the elevator,
a is the acceleration of the elevator, as given a=1/2 g upward.
So, [tex]F_{net}=m\times \frac 1 2 g[/tex]
[tex]F-mg=m\times \frac 1 2 g \\\\F=mg+ \frac 1 2 mg \\\\F= \frac 3 2 mg.[/tex]
So, the reading on the scale in the elevator is [tex]\frac 3 2 mg[/tex].
Hence, option (c) is correct.
Which circuit would have the most electrical power?
Circut C have most electrical power, the product of the voltage and current is highest for circuit C.
Electric Power:
It can be defined as the product of the voltage and current.
P = V x I
For circuit C
P = 4.6 x 0.6 = 2.76
Since, the product of the voltage and current is highest for circuit C.
Therefore, circut C have most electrical power.
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c) The infra-red detectors are made from thermocouples soldered to blackened metal plates. These are connected to galvanometers. In the space below, draw
a labelled diagram of a thermocouple. [2] [Total 6]
The infra-red detectors are made from thermocouples soldered to blackened metal plates. These are connected to galvanometers.
What is galvanometers?A galvanometer measures electric current electromechanically. Early galvanometers were not calibrated, but later models, called ammeters, were, and could measure current flow more precisely.
A galvanometer functions by deflecting a pointer in response to an electric current running through a coil in a steady magnetic field. Galvanometers can be viewed as a particular type of actuator.
The discovery that a magnetic compass needle deflects when near an electric current-carrying wire led to the invention of galvanometers, which was made by Hans Christian rsted in 1820. They were the first tools used to find and gauge minute currents. The apparatus was given the name Luigi Galvani by André-Marie Ampère after the Italian electricity researcher who, in 1791, discovered it.
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What is white noise?
Answer:
white noise is a random signal having equal intensity at different frequencies, giving it a constant power spectral density
Answer:
White noise refers to sounds that mask other sounds that might occur naturally in an environment. If you live in a city, for example, white noise could help block out noises associated with traffic. Specific sounds might be used to help encourage sleep regardless of environmental noises.
Which statement correctly compares radio waves and microwaves?
A. Radio waves have shorter wavelengths and lower frequencies than microwaves.
B. Radio waves have longer wavelengths and higher frequencies than microwaves.
C. Radio waves have longer wavelengths and lower frequencies than microwaves.
D. Radio waves have shorter wavelengths and higher frequencies than microwaves.
Answer:
C. Radio waves have longer wavelengths and lower frequencies than microwaves.
Explanation:
Radio waves and microwaves are both electromagnetic waves. They do not require a medium for their propagation.
These waves are produced as result of the vibration between electric and magnetic fields perpendicular to one another.
On the electromagnetic spectrum, the waves are listed from left to rightAlong the spectrum, wavelength increases as frequency decreases. Energy also decreases to the right on the spectrum. Since microwaves comes before radio waves, they have shorter wavelength and higher frequency than micro waves.Two Forces 20N and 50N act at a point and at an angle of 120 to each. Draw a force diagram for the system
the resultant force is F=F1-F2.
F1 = 20 N, and F2 = 50 N
In this instance, two different resultant forces are feasible.
when the two are at an angle of A with one another.
See the outcome in case 1 of the image if both are facing the same way. if they are both facing the opposite directions. when both are at a zero-degree angle from one another If they are parallel to one another and moving in the same direction, the resultant force is F=F1+F2. If they are parallel but moving in the opposite direction, the resultant force is F=F1-F2.
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A ball is thrown upward at 25 m/s from the ground. What is the maximum height of the ball?
Answer:
31.25 meters in a time of 2.5 seconds.
Explanation:
Because your question gives a number that is a multiple of 5, that is just begging for us to set a = -g = -10 m/s^2. This is acceleration due to gravity. Then, we have an equation vf = v0 + at where v0 = 25 m/s. Plugging in the earlier known values and letting vf = 0 (when final velocity is zero there is maximum height), we get t = 2.5 s. Then, Delta y = vot - 1/2 gt^2. This gives 62.5 - 31.25 = 31.25 m.
Thus, our answer is 31.25 meters in a time of 2.5 seconds.
*Note: g is more precisely 9.806 m/s^2, but that would lead to more annoying sig figs in our answer so I chose to round to 10 m/s^2 which is common.
What is the mass of an object weighing 63 N on Earth? (Earth g = 9.8 m/s^2) *
0.1 kg
O 6.4 kg
73 kg
O617.4 kg
If cach herco in pulling with
Answer:
6.4 kg
Explanation:
From Newton's second law of motion,
F = ma
or, 63 = m * 9.8
or, 63÷9.8 = m
or, m = 6.4
1 point
How fast does a 400 kg car have to move to have a momentum of 800
kgm/s?
Answer:
2m/s
Explanation:
Given parameters:
Mass of car = 400kg
Momentum = 800kgm/s
Unknown:
Speed of the car = ?
Solution:
The momentum of a car is amount of motion it posses;
momentum = mass x velocity
Insert the parameters and solve;
800 = 400 x v
v = 2m/s
Computer-enhanced x-rays are called __________ scans. a. tms b. pet c. ct d. mri please select the best answer from the choices provided a b c d
Computer-enhanced x-rays are called CT scans.
A CT scan is a computer-based technology and refers to the inside image of the body generated by using X-rays and advanced scientific technology.
The image shows detailed information about various body parts including bones, organs, blood vessels, veins, fat, and muscles.
CT scans are more advanced, innovative, and detailed technology compared to standard X-ray techniques.
Experts performing CT scans are known as radiology technologists or radiographers.
It differs from CAT which is the reduced form of Computer Axial Tomography.
The major difference between CT scan and MRI is that CT scan uses X-rays while MRI uses magnetic fields.
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If a bicycle has an average acceleration of -0.44 m/s^2, and its initial forward velocity is 8.2 m/s, how long will it take the cyclist to bring the bicycle to a complete stop
Answer:
The value is [tex]t = 18.6 s[/tex]
Explanation:
From the question we are told that
The average acceleration of the bicycle is [tex]v = -0.44 \ m/s^2[/tex]
The initial forward velocity is [tex]u = 8.2 \ m/s[/tex]
Generally from kinematic equations we have that
[tex]v = u + at[/tex]
Here v is the final velocity of the bicycle and the value is v = 0 m/s
So
[tex]0 = 8.2 + (-0.44)t[/tex]
=> t = 18.6 s