The air in a closed room has
1) mass,
2) energy,
3) weight,
4) all of these,
5) none of these,
and the greater the rate of molecular motion in the air, the greater the
6) temperature.
7) molecular kinetic energy.
8) air pressure.
9) all of these.
10) none of these.
Answer: 4, 9
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A 3rd magnitude star appears 2.5 times brighter than a 4th magnitude star
Indicate whether the statement is true or false
You have a machine which can accelerate pucks on frictionless ice. Starting from rest, the puck travels a distance x in time t when force F is applied. If force 3F is applied, the distance the puck travels in time t is
a. x. b. (3/2)x. c. 3x. d. (9/2)x. e. 9x.
A planar loop consisting of four turns of wire, each of which encloses 200 cm2, is oriented perpendicularly to a magnetic field that increases uniformly in magnitude from 10 mT to 25 mT in a time of 5.0 ms. What is the resulting induced current in the coil if the resistance of the coil is 5.0 ??
a. 60 mA b. 12 mA c. 0.24 mA d. 48 mA e. 6.0 mA