A rocket, initially at rest, is fired vertically with an upward acceleration of 10 m/s2 . At an altitude of 0.50 km, the engine of the rocket cuts off. What is the maximum altitude it achieves?
a. 1.9 km
b. 1.3 km
c. 1.6 km
d. 1.0 km
e. 2.1 km
d
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How would you explain to your friend, who knows nothing about astronomy, the way to predict the next eclipse of the Sun?
What will be an ideal response?
Two sources emit beams of light of wavelength 550 nm. The light from source A has an intensity of 10 µW/m2,
and the light from source B has an intensity of 20 µW/m2. This is all we know about the two beams. Which of the following statements about these beams are correct? (There could be more than one correct choice.) A) Beam B carries twice as many photons per second as beam A. B) A photon in beam B has twice the energy of a photon in beam A. C) The frequency of the light in beam B is twice as great as the frequency of the light in beam A. D) A photon in beam B has the same energy as a photon in beam A. E) None of the above statements are true.
Halving the mass of the bob on a simple pendulum will cause a change in the frequency of the pendulum swing by what factor?
a. 4.0 c. 1.0 b. 2.0 d. 0.50
Why do we use fuses?
a. to eliminate shock hazards b. to prevent fires c. to save on the cost of electricity d. to store charge