Physical science
What is the impulse of an 8 kg ball rolling at 2 ms when it bumps into a pillow and stops ?
-16 kg ms
Page 43 in shipman : determine the magnitude of the centripetal acceleration of a car going 12 ms ( about 27 mi/ h) on a circular cloverleaf with a radius of 50 m
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Using the result of example 2.3 ( the orbital speed of the earth is about 30 km/s) compute the centripetal acceleration in ms2 of the earth in its nearly circular orbit . About the sun ( r = 1.5x1011 m)
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Two 1 kg balls move away from each other, one travels 5 ms to the right and the other 5 ms to the left. What is the total momentum of this system ?
0
What is the velocity of the larger fish immediately after lunch?
0.83 ms
An object has the mass of 10 kg on earth what would be the mass of this object at the surface of this planet?
10 kg
What is the momentum of an 8 kg ball rolling at 2ms
16 kg ms
What would be the value of the gravitational acceleration at the surface of this planet?
19.6 ms2
An object has the mass of 10 kg on earth, what would be the weight of this object at the surface of this planet ?
196 N
Estimate the Acceleration due to the gravity of this planet at its surface. Choose the closest value.
2.5 ms2
What is the total momentum of the system of the 2 fish before the lunch ?
5 kg ms
The radius of the ramp is 60 m find the acceleration ?
5.4 m/s 2
An object has the mass of 20 kg on earth, what would be the weight of this object at the surface of this planet ? Choose the closest value
50 N
Two 100 kg cars drive east the first moves at 20 ms, the second at 40 ms . What is the total momentum of this system?
6000 kg ms
The car has a mass of 1250 kg what is the force which the car needs to stay on the ramp.
6750 N
What does the car need for this circular motion ?
Centripetal force
Which statement below is correct about this planet ?
Everything on the planet will fall twice faster than on earth
The total linear momentum is not conserved is there is an _____ force acting on the system
External
Which is true about the acceleration due to gravity ?
It decreases with increasing altitude
What's true about the constant G?
It's a very small constant
Which law of physics can explain your answer to the previous problem ?
Newton's first law, law of interia
What kind of force causes it to move in a straight line path after the break?
No force
What supplies the centripetal force that keeps the planets in their orbits ?
gravitational force
Which statement is NOT correct about Einstein's theory of gravity when it is compared to Newton's theory of gravity?
According to Einstein's theory, gravitational force could be repulsive as well as attractive, which Newton's theory has only gravitational force
Which statement is not correct about gravity ?
According to Newton's theory of gravity the strength of gravitational force depends directly on the weight of objects
A change in linear momentum requires which Of the following ?
All of rhese
What do we call the gravitational force between the earth to your body?
Weight
Which quantities below of a solid object on this planet are not the same as on earth ? Choose all answers .
Weight , acceleration when it falls vertically
