Your weight is the force
A) due to gravity only.
B) you exert against a supporting surface.
C) equal to your normal force on any surface.
Answer: B
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Doppler Effect: A police car has an 800-Hz siren. It is traveling at 35.0 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?
A. 0 Hz B. 82 HZ C. 166 Hz D. 249 Hz
In an isothermal process
a. the volume remains constant. b. the temperature remains constant. c. no heat is transferred between a system and its surroundings. d. the pressure remains constant. e. the internal energy is not constant.
Two charges lie on the x axis, +3q at the origin, and -2q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is
a. 1.0 m. b. 2.0 m. c. 2.5 m. d. 3.0 m. e. 4.0 m.
The astronauts feel weightless in the International Space Station, which orbits the Earth once every 90 minutes. Why?
A) because they are moving so fast B) because the gravity from the Moon cancels out the gravity from Earth C) because they and the space station are both falling around the Earth D) because there is no gravity in space