1- If the kinetic energy of a sub-atomic particle was doubled, then by what fact

Question

1- If the kinetic energy of a sub-atomic particle was doubled, then by what factor would its speed increase?

a. the square root of two

b. four

c. two

d. eight

2- A student raises a 1-kg textbook 1 m off the surface of a table. How does the work done by gravity Wgon the book compare to the work done by the student Wson the book?

a. Wg> Ws

b. Wg< Ws

c. Wg= Ws

d. None are correct.

e. More information is needed.

3- A stone is thrown up in the air and it reaches a maximum height of 10.0 m. What is the initial speed of the stone?

a. 12.0 m/s

b. 19.0 m/s

c. 20.0 m/s

d. 14.0 m/s

e. 10.0 m/s

4- A 30.0-kg crate is pushed across a rough floor by a horizontal force of 100 N. The coefficient of kinetic friction between the crate and the floor is 0.100. If a total of 80.5 J of work is done on the crate, how far was it moved along the floor?

a. 1.64 m

b. 0.840 m

c. 2.44 m

d. 1.14 m

e. 2.04 m

5- A plastic disk of radius 10 cm is spinning at 120 rpm. What is the magnitude of the centripetal acceleration of the outer rim of the disk?

a. 144 km/s2

b. 1580 m/s2

c. 15.8 m/s2

d. 1440 m/s2

6- A clothes dryer is spinning at 75 rpm. A student opens its door and it comes to rest after rotating through four revolutions. Assume constant acceleration. What was the magnitude of the dryer's angular acceleration?

a. 1410 rad/s2

b. 2.45 rad/s2

c. 1.23 rad/s2

d. 703 rad/s2

7- The sum of the forces acting on an object is equal to

a. the object's momentum.

b. the impulse the object recieves.

c. the rate of change of the object's momentum.

d. none are correct.

8- The angular speed of the minute hand of a clock is _______.

f. none are correct.

9- A force of 40.0 N is applied to a crate to displace it by 50.0 m. How much work is done on the crate by this force?

a. 2.25

1- If the kinetic energy of a sub-atomic particle was doubled, then by what factor would its speed increase? the square root of two four two eight A student raises a 1-kg textbook 1 m off the surface of a table. How does the work done by gravity Wg on the book compare to the work done by the student Ws on the book? Wg > Ws Wg

Explanation / Answer

1) a. the square root of two

2) b. Wg < Ws

3) d. 14.0 m/s

4) d. 1.14 m

5) c. 15.8 m/s2

6) c. 1.23 rad/s2

7) c. the rate of change of the object's momentum

8) e. (pi/30) rad/s

9) d. 2.00

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