A 1.8-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 3.0 m/s2 down the incline. Determine the magnitude of the force of friction acting on the block
a. 4.2 N
b. 3.0 N
c. 3.4 N
d. 3.8 N
e. 2.3 N
c
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Astronaut Jennifer's lifeline to her spaceship comes loose and she finds herself stranded, "floating" 100 m from the mothership. She suddenly throws her 2.00-kg wrench at 20 m/s in a direction away from the ship
If she and her spacesuit have a combined mass of 200 kg, how long does it take her to coast back to her spaceship? A) 1000 s B) 750 s C) 500 s D) 250 s E) 2.50 min
A magnetic dipole has two stable orientations in a magnetic field. At what two angles relative to the magnetic field direction are these orientations?
a) 0° and 90° b) 0° and 180° c) 90° and 270° d) 45° and 135° e) 45° and 90°
The minimum current that will usually kill the average person is
A) 10. A. B) 0.1 A. C) 1. A. D) 0.01 A. E) 0.1 mA.
Which statement about the cosmic microwave background is not true?
A) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies. B) Its spectrum corresponds to a temperature of just under 3 degrees above absolute zero. C) It is thought to be radiation that began its journey to our telescopes when the universe was about 380,000 years old. D) With the exception of very small variations, it appears essentially the same in all directions in which we look into space.