Ch. 5 Physics
A very light cord holding a 300 N box is moved at a constant velocity across a 15 m level surface what is the network done in the process (a) 0 (b) 1/20 J (c) 20 J (d) 2000 J
(a) 0
Hey 7.00 kg bowling ball falls from a 2.00 m south just before hitting the floor will be it's kinetic energy (a) 14.0 J (b) 19.6 J (c) 29.4 J (d) 137 J
(a) 14.0 J
Who won thousand 1200 kg automobile moving at 25 m/s has the brakes applied with the deceleration of 8.0 m/s^2 how far does the car travel before it stops (a) 39 m (b) 47 m (c) 55 m (d) 63 m
(a) 39 m
What is the minimum amount of energy required for an 80 kg climber carrying a 20 kg pack to climb mount Everest 8850 m high (a) 8.67 MJ (b) 4.16 MJ (c) 2.47 MJ (d) 1.00 MJ
(a) 8.67 MJ
Which of the following is that form of energy associated with an objects location in a conservative force (a) potential (b) thermal (c) bio chemical (d) kinetic
(a) potential
Horizontal force of 200 N is applied to a 55 kg cart across a 10 m level surface if the cart accelerate at 2.0 m/s^2 then what is the work done by the force of friction as it acts to retard the motion of the cart (a) -1100 J (b) -900 J (c) -800 J (d) -700 J
(b) -900 J
As an object is lowered into a deep hole in the surface of the earth which of the following must be assumed in regards to its potential energy (a) increase (b) decrease (c) remains constant (d) can not tell from the information given
(b) decrease
What is the kinetic energy of a 0.135 kg baseball thrown at 40.0 m/s(90.0 mph) (a) 54.0 J (b) 87.0 J (c) 108 J (d) 216 J
(c) 108 J
Robin pushes a box 5.00 m by applying a 25.0 Newton horizontal force what work does she do (a) 10.0 J (b) 25.0 J (c) 125 J (d) 550 J
(c) 125 J
A golf ball hits a wall and bounces back at 3/4 the original speed what part of the original kinetic energy of the ball didn't lose in the collision (a) 1/4 (b) 3/8 (c) 7/16 (d) 9/16
(c) 7/16
A horizontal force of 100 N is applied to move a 45 kg cart across a 9.0 m level surface what work is done by the 100 N force (a) 405 J (b) 500 J (c) 900 J (d) 4500 J
(c) 900 J
Which of the following is an example of a non-conservative force (a) gravity (b) magnetism (c) friction (d) both gravity and magnetism
(c) friction
A satellite is held in orbit play 2000 N gravitational force each time the satellite complete an orbit of circumference 80,000 km the work done on it by gravity is (a) 1.6 x10^8 J (b) 1.6 x10^11 J (c) 6.4 x10^11 J (d) 0
(d) 0
Are use the rope 2.00 m Long to swing a 10.0 kg weight around my head the tension in the rope is 20.0 N and have a revolution how much work is done by the rope on the weight (a) 40.0 J (b) 126 J (c) 251 J (d) 0
(d) 0
A rock is thrown straight up with an initial velocity of 15.0 m/s ignore energy lost their friction how high will the rock rise (a) 1.53 m (b) 22.9 m (c) 6.50 m (d) 11.5 m
(d) 11.5 m
If both mass and velocity of a ball or tripled the connect energy is increased by a factor of (a) 3 (b) 6 (c) 9 (d) 27
(d) 27
A work pushes a sled with a force of 40 N over a level distance of 6.0 m if the frictional force of 24 N acts on the wheelbarrow in the direction opposite to that of the worker, what network is done on the wheel barrow (a) 240 J (b) 216 J (c) 144 J (d) 96 J
(d) 96 J
The unit of work, Joule, is dimensionally the same as (a) N/s (b) N/kg (c) N-s (d) N-m
(d) N-m
The work done by static friction can be (a) positive (b) negative (c) zero (d) any of these
(d) any of these
If during a given physical process the only force acting on an object is friction which of the following must be assumed in regard to the objects kinetic energy (a) it decreases (b) it increases (c) it remains constant (d) it can not be determined from the information given
(d) it can not be determined from the information given
Which of the following is the form of energy associated with an objects motion (a) potential (b) thermal (c) bio chemical (d) kinetic
(d) kinetic
When an object is dropped from a tower what is the effect of the air resistance as it falls (a) does positive work (b) Increases the objects kinetic energy (c) Increases the objects potential energy (d) none of the above choices are valid
(d) none of the above choices are valid
