The relation between the Doppler shift of galaxies and their distances is called
A) the cosmological principle.
B) Hubble's law.
C) special relativity.
D) Olbers's paradox.
E) general gelativity.
B
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Composite _________is produced by laying fibers in random directions in a plane.
Fill in the blank(s) with the appropriate word(s).
Which has greater kinetic energy?
A) a car traveling at 30 km/hr B) a car of half the mass traveling at 60 km/hr C) both the same D) need more information
Which of the following is a conservative force? (All refer to a car on a slope.)
a. The force you exert on the car pushing it uphill. b. The force exerted by rain drops falling on the car. c. The frictional force of the road on the car. d. The gravitational force acting on the car. e. The force you exert on the car (pushing it uphill) after it starts to slide downhill.
If the length of a wire increases, its resistance decreases
Indicate whether the statement is true or false