Answer:
1.07m/s²
Explanation:
From the question we are given the following
applied force Fapp = 450N
mass of the safe m = 100kg
Weight of the safe W = 980N
coefficient of kinetic friction n = 0.35
Required
Acceleration of the safe
According to Newton's second law
\sum Fx = ma
Fapp - Ff = ma
Ff is the frictional force
Fapp - nmg = ma
450 - 0.35(100)(9.8) = 100a
450 - 343= 100a
107 = 100a
a = 107/100
a = 1.07m/s²
Hence the acceleration of the safe is 1.07m/s²
How much work is done by a 120 N force in 5 meters? *
Answer:
w=f×d
=120×5
=600 j...........
Question 3 (1 point)
The nucleus occupies most of the space of an atom
True
O False
Answer:
the correct answer is false
A ball rolls across the ground and slows to a stop.
Does gravity do work in stopping the ball?
Explain.
(Drawing a picture will help.)
gravity does help the ball since gravity pulls down objects, it causes more friction on the ball therefore causing the ball to slow down faster.
You and your friends are playing tug of war. Your team pulls with a force of 55 N, to the right. The other team pulls with a force of 65 N to the left. What is the net force on the rope
Answer:10 N
Explanation:
Subtract them and u will see it will be 10n so the net force will be 10 n why you should subtract them is because
They both are different amounts
Different forced of strength
Different N numbers
Think of it like the is an unequal amount of student so one side has 2 students and the other side has 4 students
Compare the speed that light waves travel in air to the speed that sound waves travel in the air. How many times faster do light waves travel in air in comparison to sound waves in air?
Answer:
As a rule sound travels slowest through gases, faster through liquids, and fastest through solids. The speed of light as it travels through air and space is much faster than that of sound; it travels at 300 million meters per second or 273,400 miles per hour. ... Speed of light in glass = 200 million m/s or 182,300 mph.
Explanation:
Almost always sound travels slowest via gases, faster via beverages, and fastest via solids. The velocity of light because it travels via air and area is a great deal quicker than that of sound; it travels at 300 million meters consistent with 2d or 273,400 miles in step with hour.
The pace of light in glass = 2 hundred million m/s or 182, 300 mph.
How are light waves and sound waves extraordinary?Mild waves are electromagnetic waves whilst sound waves are mechanical waves. Mild waves are transverse even as sound waves are longitudinal. Light waves can tour in a vacuum. Sound waves require a material medium to journey, and as a result, can not travel in a vacuum.
Nothing can travel faster than light except for sound. This is the declaration of a few US physicists, who say they've designed an unusual waveguide to make the sound move at “superluminal” speeds (Appl. Phys.
In 2015, a team of Scottish scientists announced that they had found a way to gradual the rate of mild. By sending photons via a unique mask, the researchers altered their shape. In this malformed kingdom, these infinitesimal particles of light traveled slower than normal photons.
Learn more about the speed and sound wave of light waves here: https://brainly.com/question/2142871
#SPJ2
According to the rock cycle, when liquid magma cools into a solid, what is formed?
Answer:
Similarly, liquid magma also turns into a solid — a rock — when it is cooled. Any rock that forms from the cooling of magma is an igneous rock. Magma that cools quickly forms one kind of igneous rock, and magma that cools slowly forms another kind. ... The kind of rock formed in this way is called intrusive igneous rock.
Explanation:
Answer: Igneous rock.
Explanation:
The kind of rock formed in this way is called intrusive igneous rock.
Why can we say that the ratio of net force to mass is constant forany dropped object on Earth?
Answer:
All objects free fall at the same rate regardless of their mass. Because the 9.8 N/kg gravitational field at Earth's surface causes a 9.8 m/s/s acceleration of any object placed there, we often call this ratio the acceleration of gravity.
Explanation:
Newton's Second Law, if I remember right.
GIVING BRAINLIEST LOOK AT THE DIAGRAM AND AWNSER THE QUESTION
Which statement is best supported by the diagram?
Kinetic energy becomes potential energy between points R and S.
Maximum potential energy is at point P.
Maximum potential energy is at point R.
Potential energy becomes kinetic energy between points P and Q.
Answer:
Option D)Potential energy becomes kinetic energy between points P and Q.
Explanation:
A cricket can travel approximately 8 m/s. How many meters could a cricket travel in 75
s?
Answer:
Your answer will be 600meters
A child approaches a stop sign and applies the brakes to slow to a stop. If the bicycle and child were originally traveling at 9.00 m/s and the breaks cause a deceleration of magnitude 1.20 m/s^2, how long will it take the child to stop?
Answer:
7.5secs
Explanation:
Using the equation of motion
v = u + at
v is the final velocity = 0m/s
u is the initial velocity = 9m/s
a is the deceleration = -1.2m/s²
t is the required time
Substitute;
0 = 9 + 1.2(t)
-9 = -1.2t
t = -9/-1.2
t = 7.5secs
hence it takes the child 7.5secs to stop
5.
A badminton shuttlecock leaves the racquet traveling 30 m/s. It goes over the net 0.5
seconds later with a speed of 10 m/s. Calculate its average acceleration.
Answer:
[tex]a=40\ m/s^2[/tex]
Explanation:
Given that,
Initial speed of a shuttlecock, u = 30 m/s
Final speed of the shuttlecock, v = 10 m/s
Time, t = 0.5 s
We need to find its average acceleration. The acceleration of an object is equal to the change in speed divided by time taken. It is given by :
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{10-30}{0.5}\\\\a=-40\ m/s^2[/tex]
So, the average acceleration of badminton shuttlecock is [tex]40\ m/s^2[/tex].
49. A 6.1-kg bowling ball is liſted 2.1 m to a shell. Find
the increase in the ball-Farth system's energy.
Answer:
125.5J
Explanation:
Given parameters:
Mass of the bowling ball = 6.1kg
Height of lifting = 2.1m
Unknown:
Increase in the ball energy = ?
Solution:
The ball has changed position by moving it from one point to another. So, it has acquired more potential energy.
Potential energy = mgh
m is the mass
g is the gravity
h is the height
Now insert the given parameters and solve;
Potential energy = 6.1 x 9.8 x 2.1 = 125.5J
When will the human population stop growing?
When physical activity is a set plan or program for all ages, usually performed by a group through a local recreational unit, it is called:
a
highly competitive.
b
planned exercise program.
c
sports activity.
d
self-directed.
Answer:
C. Sports activity
Explanation:
A sport activity is a form of competitive physical activity in forms of games. They are normally organized for individuals to participate with the aim of improving physical abilities and skills, bring enjoyment to participants and act as a form of entertainment.
What is specific heat capacity
Answer:
Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to a given mass of a material to produce a unit change in its temperature. The SI unit of heat capacity is joule per kelvin. Heat capacity is an extensive property
A woman does 236 J of work
dragging her trash can 24.4 m to
the curb, using a force of 18.9 N.
At what angle was her force
directed?
(Unit = degrees)
Answer:
The woman's force was directed 59.22⁰ to the horizontal.
Explanation:
Given;
work done by the woman, W = 236 J
distance through the load was moved, d = 24.4 m
applied force, F = 18.9 N
inclination of the force, = θ
The work done by the woman is calculated as;
W = Fdcosθ
[tex]cos \ \theta = \frac{W}{Fd} \\\\cos \ \theta = \frac{236 }{18.9 \times 24.4} \\\\cos \ \theta = 0.5118\\\\\theta = cos^{-1} ( 0.5118)\\\\\theta =59.22^0[/tex]
Therefore, the woman's force was directed 59.22⁰ to the horizontal.
Answer:
59.22⁰
Explanation:
How can you tell is energy has been transferred or transformed
Answer:
In mY Knowledge
Energy transfer is the movement of energy from one location to another. Energy transformation is when energy changes from one type to another. While energy can be transferred or transformed, the total energy always remains the same.
Hope iT HeLps :D
Answer:
You can tell if energy has been transferred when something works when you put a body of energy in it. For example, you'll know when energy is transferred if you plug a lamp cord into an electric socket and the lamp turns on. Energy is being transferred from the socket to the lamp.
You can tell when energy is being transformed when it changes from one energy to another. You can know when energy is being transformed when you turn on a stove. Chemical energy transforms into electric energy.
I hope that helps!
If it is correct, may I be brainliest?
Thanks for the help :)
If we rub a rubber rod against a piece of fur the rod gains a negative change. Why does the rod have a negative charge?
Answer:
because the rod takes electrons from the fur when rubbed across it
A captain of a fishing boat notices that during a certain time each year high tides are higher and low tides are lower. Which conclusion could the captain accurately draw?
Answer:
The Moon is at the closest part of its orbit around Earth; the Sun and the Moon form a straight line with Earth.
Explanation:
The conclusion the captain could draw accurately is that;
The moon is probably at the closest part of its orbit moving round the earth. In addition, that the sun and the moon have formed a straight line with earth. This is due to the fact that high tides are higher and low tides are lower at a particular time each year.
A trolley of 20kg move 60 gm.Find out the work done by the trolley.
Answer:
11760
Explanation:
m= 20kg
d= 60 m
work done = force .distance= 20*9.8*60= 11760Nm
What is the elevation at point A?
Answer:
i think that says 4800
its the same as the number at the bottom
If the work done on a object is 100 J and it comes to a rest on a surface with a mass of 10
kg and a SHC of 1000 J/kg-C calculate the change in temperature.
apparent brightness depends on which two properties?i’ll give brainlist?:)
Answer:
D
Explanation:
I just did it on a p e x
Answer:
D
Explanation:
Suppose a woman raises a 65 N object in 2m in 4 seconds.
Calculate the work is done and her power.
Science
Answer:
[tex]\huge\boxed{\sf P.E = 130\ Joules}[/tex]
[tex]\huge\boxed{\sf P = 32.5\ Watts}[/tex]
Explanation:
Given Data:
Weight = W = 65 N
Height = h = 2 m
Time = t = 4 secs
Required:
Power = P = ?
Work Done in the form of Potential Energy = P.E. = ?
Formula:
P.E. = Wh
P = P.E. / t
Solution:
P.E. = (65)(2)
P.E = 130 Joules
P = P.E. / t
P = 130 / 4
P = 32.5 Watts
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH18071. What happened to the force of friction when you increased the
weight on the cart?
1. How does speed affect the amount of kinetic energy in a moving object? Explain how you
know by stating your claim, the evidence for your claim, and your reason why this evidence
supports your claim.
I’ll mark as brainliest
Explanation:
The kinetic energy of a moving object is directly proportional to its mass and directly proportional to the square of its velocity. This means that an object with twice the mass and equal speed will have twice the kinetic energy while an object with equal mass and twice the speed will have quadruple the kinetic energy.
how do mass and distance affect the force of gravity between on objects
The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them. This means that the force of gravity increases with mass, but decreases with increasing distance between objects.
A substance that is composed of two or more
atoms that are chemically bonded together is
called an)
compound
mixture
element
matter
Explanation:
COMPOUND
hknobrdjkbkmsmsnz
Identify the type of reaction (combustion, synthesis, decomposition, single replacement, or double replacement) this equation represents.
CH4 + O2 CO2 + H2O
Answer:
Combustion
Explanation: