Question

1. The equation

Δ?=?0?+0.5??2Δx=v0t+0.5at2

Can be used to describe an object's position x. When can this equation be applied?

Group of answer choices:

A. Displacement must be constant

B. The object must be acted on by no more than one force

C. Velocity must be constant

D. Acceleration must be constant

E. The force acting on the object must be gravity

2. If a vector A has a y component equal to

|?|cos?|A|cos⁡θ, then the angle

?θ is the angle between the vector and

Group of answer choices:

A. cannot be determined

B. the x axis

C. the y axis

3. A 0.4 kg ice cube at 0.0°C has sufficient heat added to it to cause total melting, and the resulting water is heated to 56°C. How much heat was added during this process (in Joules)?

Specific heat of water is 4190 J/(kg*K).

Specific heat of ice is 2108 J/(kg*K).

Heat of fusion for water is 3.33×1053.33×105

Heat of vaporization for water is 22.6×10522.6×105

4. In order to get an object moving, you must push harder on it than it pushes back on you.

Group of answer choices:

True Or False

5. A potter's wheel (a solid, uniform disk) of mass 7.4 kg and radius 0.95 m spins about its central axis. A 0.57 kg lump of clay is dropped onto the wheel at a distance 0.55 m from the axis. Calculate the rotational inertia of the system (in kg*m^2).

6. Two objects are dropped from a tall building, an interval of 1.0 s apart. During the time that both objects continue to fall, the separation between them

Group of answer choices:

A. decreases.

B. stays constant.

C. increases.

D. increases at first, but then stays constant.

E. decreases at first, but then stays constant.

Answer 1