Deck 1: What Is Science?, Motion, Wave Motions, Sounds, Energy, Heat and Temperature

Question 1

The frequency is the time required for one complete cycle of a swinging pendulum.

Answer 1

False

Question 2

Sound waves moving through air are transverse.

Answer 2

False

Question 3

A radio playing music at 20 dB intensity is twice as loud as one playing at 10 dB.

Answer 3

False

Question 4

If v = $\lambda$ f, then how are $\lambda$ and f related?

A) $\lambda$ is directly proportional to f
B) $\lambda$ is inversely proportional to f
C) $\lambda$ is a factor of f
D) $\lambda$ and f are unrelated

Question 5

A liquid at 20ºC is twice as hot as the liquid at 10ºC.

Question 6

In the equation: Q = mc $\Delta$ t, the c represents the

A) speed of light.
B) number of calories gained or lost.
C) convection coefficient.
D) type of material.

Question 7

The "touch" sensors our human bodies use to judge temperature operates

A) very poorly, sensing only heat flow.
B) within 5°C of the actual temperature.
C) better than most thermometers.
D) None of the answers is correct.

Question 8

Why is solar energy becoming more common for household electricity use?

A) becoming more expensive
B) becoming less expensive
C) solar cells are smaller today than in the past
D) chemical storage batteries are dangerous

Question 9

Roughly, what fraction of our nation's electrical energy needs in total is supplied by coal?

A) 10 percent
B) 30 percent
C) 60 percent
D) 80 percent

Question 10

You can find the potential energy of a book of a known mass just before it hits the floor after falling a known distance by using which equation?

A) W = Fd
B) K.E. = ½ mv²
C) P.E. = mgh
D) None of the answers is correct.

Question 11

To hit a golf ball farther, you should "follow through the swing" because

A) this increases the force.
B) momentum is conserved.
C) of the relationship $\Delta$ p = Ft.
D) momentum is mv.

Question 12

A 250 g ball travels at a velocity of 40 m/s. Its momentum is

A) 4 kg•m/s.
B) 10 kg•m/s.
C) 160 kg•m/s.
D) 10,000 kg•m/s.

Question 13

The mass of 1000 cm³ of water is a kilogram.