A force of stretches a very light ideal spring from equilibrium. What is the force constant (spring constant) of the spring?
A) 41 N/m
B) 22 N/m
C) 34 N/m
D) 46 N/m
A
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Power: The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW. The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?
A. The power is still 2.0 kW. B. The power increases to 2.2 kW. C. The power decreases to 1.8 kW. D. None of the given answers is correct.
You are standing on a bathroom scale in an elevator that is not moving and it reads 500 N. The elevator then moves downward at a constant velocity of 4.50 m/s. What does the scale read?
A. 100 N B. 450 N C. 500 N D. 750 N E. 250 N
To date, we've found few planets orbiting their stars at distances comparable to the distances of the jovian planets in our solar system. Why do astronomers think this is the case?
A) We have not yet been searching for planets at such distances for a long enough time. B) Planets at such distances are extremely rare. C) No known method can detect planets at such large distances. D) Planets at such distances are probably low in mass.
How is Einstein's famous equation, E = mc2, important in understanding the Sun?
A) The Sun has a magnetic field strong enough to influence the atmospheres of the planets. B) The Sun's surface temperature is about 6,000° Celsius. C) The Sun is extremely massive. D) The Sun generates energy to shine by losing 4 million tons of mass each second.