Which of the following is an example of convection?

a a hot object transferring heat to a cooler one

b the rays of the Sun warming the earth

c a hot oven warming the air around it

d hot air rising and cooler air falling

What type of reaction is occurring when you activate an instant cold pack?

A pendulum bob is made of a ball filled with water. What would happen to the frequency of vibration of this pendulum if a hole in the ball allowed water to slowly leak out? (Treat the pendulum as a simple pendulum).

Which statement best explains the movement of electric current from the clouds to the ground during a lightning storm?. A. the ground and the clouds are both negatively charged. B. the ground and the clouds are both positively charged C.

Which planet would float if placed in water

Which of the following is a difference between sound and light? 1. Humans can only detect light, not sound 2. Only light travels as a wave 3. Sound travels faster than light 4. Only light can travel through space, not sound

A 2kg blob of putty moving at 4 m/s slams into a 6kg blob of putty at rest what is the speed of the to stick together blobs immediately after colliding

A stone is thrown vertically upward with a speed of 12m/s from the edge of a cliff 70 m high (a) How much later it reaches the bottom of the cliff? (b) What is its speed just before hitting? And (c) what total distance did it travel? (Ans: 5.

After completing a career search, Patrick has decided that he wants to be a paralegal. Which two skills or abilities are important for him to have in order to excel in this career?

The highest peak in the vicinity (<100 kilometers) of Mt. Kilimanjaro is located to the: a. north. b. west c. east. d. south. e. northeast

Which of the following lists contains only examples of renewable sources of energy? A. wind, tidal, geothermal, and hydroelectric B. coal, solar, wind, and biomass C. fossil fuels and nuclear energy D. hydroelectric, petroleum, solar, and wind