The specific heat capacity of aluminum is 0.22 cal/g°C. How much energy needs to flow into 20.0 grams of aluminum to change its temperature by 15°C?

0.017 cal

0.29 cal

66 cal

1363 cal

If mass is constant but force increases what will happen to the acceleration of the object

How would you explain a thin layer of ice breaking under your weight

If a star has no measurable parallax what can you infer?

Helen keller writes in chapter 14, the winter of 1892 was darkened by the one cloud in my childhood's bright sky. what was the cloud?

You are tossing a ball directly up into the air. Before the ball leaves your hand, you are exerting a force directed against the force of gravity. If you apply a net force of 10 N to a 1 kg ball, what is the normal force acting on the ball?

Two electrons are 2.3nm apart. What is the force between two electrons?

3. In a demonstration learning activity, A. the teacher shows children how something works or how to complete an entire activity. B. each child shows and tells about a favorite toy. C.

A 0.12 kg paper airplane flies in a straight line at a speed of 1.3 m/s. How much kinetic energy does the airplane have?

Each atom is composed of electrons and positive material. The mass of the atom is evenly spread throughout the atom. Neutrons are located in the center of the atom. Positive charge occupies a very small volume in the atom.

A hot-air balloon is ascending at the rate of 14 m/s and is 84 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?