Question

1- Room temperature is about 72 OF. What is room temperature in Kelvin?

a) 22 K

b) 273 K

c) 295 K

d) 345 K

e) none of these.

2- A ball is thrown into the air. As it rises, there is an increase in its

a) acceleration.

b) velocity.

c) kinetic energy.

d) gravitational potential energy.

e) momentum.

3- A force whose components you know acts on an object. It pushes 3.0 N in the +x-direction and 4.5 N in the —ydirection. Which of the following describes the magnitude and direction of this force?

a) 7.5 N force, 45 0 S ofE

b) 7.5 N force, 45 0 N ofE

c) 5.4 N force, 56.3 0 S ofE

d) 5.4 N force, 33.70 S ofE

e) 29 N force, 33.70 N ofE

4- Which of the following could describe the directions of the velocity and acceleration for an object that is speeding up?

a) velocity to the left; acceleration to the right

b) velocity to the left; acceleration to the left

c) velocity to the right; acceleration to the left

d) all of these describe an object that is speeding up

e) none of these describe an object that is speeding up

5- If the object in the last problem moves 2.0 m in the +y-direction, how much work does that force do on the object?

a) -9 J

b) -6 J

c) 6 J

d) 9 J

e) 10.8 J

Answer 1

#02-32) 2731S 3 4 S velocity and accelevatun Shadd