A spacecraft is measured by an observer on the ground to have a length of 53 m as it flies toward the earth with a speed 1.7 × 108 m/s
The spacecraft then lands and its length is again measured by the observer on the ground, this time while the spacecraft is at rest on the launchpad. What result does he now get for the length? (c = 3.00 × 108 m/s)
64 m
You might also like to view...
Satellite Motion: Satellite A has twice the mass of satellite B, and moves at the same orbital distance from Earth as satellite B. Compare the speeds of the two satellites.
A. The speed of B is twice the speed of A. B. The speed of B is one-half the speed of A. C. The speed of B is one-fourth the speed of A. D. The speed of B is equal to the speed of A. E. The speed of B is four times the speed of A.
When is friction a potential problem for applying conservation of momentum to a system?
A. When friction is an external interaction B. When friction is an internal interaction C. In both cases D. In neither case
Compared to the average surface temperature on the surface of the Earth, the average surface temperature on the surface of Mars is
A) about the same B) much lower C) just slightly lower D) much higher
What is the rate of heat flow through a pane of glass that is 40.0 cm by 30.0 cm with a thickness of 4.00 mm when the outside temperature is -10.0°C and the inside temperature is 25.0°C?
The thermal conductivity of glass is 0.105 W/(m?K) and the specific heat of glass is 0.180 cal/(g?°C). A) 24.2 W B) 3.81 W C) 18.6 W D) 47.3 W E) 110 W