When an inflated balloon is exposed to cold air,

a.

the particle motion inside the balloon rises.

b.

the pressure inside the balloon rises.

c.

the volume of the balloon decreases.

A 1430 W radiant heater is constructed to operate at 115 V. (a) What is the current in the heater when the unit is operating? (b) What is the resistance of the heating coil? (c) How much thermal energy is produced in 1.00 h?

Adolescents require fewer hours of physical activity than adults.

Which of the following physical properties can be used to measure temperature using a thermometer? a. volume b. pressure c. density d. viscosity

How do you think air resistance affects measured values of g? If you used a ping pong ball, for example, how would this affect the fall-time?

A friend says that tempature increases as altitude increases because you are moving closer to the sun. Is this true?

A starship passes Earth at 80% of the speed of light and sends a drone ship forward at half the speed of light rela - tive to itself. Show that the drone travels at 93% of the speed of light relative to Earth.

Rubies are used in electronics

Two kids are on a merry-go-round that is turning at a constant rate. ariel is near the outer edge, and bob is closer to the center. ariel has answer (smaller, the same, or greater angular speed?

Visit this website and locate the element mercury, whose chemical symbol is Hg. Click on the square to read about the history, properties, and uses of mercury. Name three uses for mercury.

Ten seconds after starting from rest, a car is moving at 40 m/s. what is the car's acceleration in meters per second per second?