Ignoring the effects of the atmosphere, what is the theoretical resolution of an 8-inch telescope (about 20 cm) if you are looking at visible light with a wavelength of about 500 nm?
A. about half a degree
B. about 1/100 of an arc second
C. about 25 arc seconds
D. about half an arc second
Answer: D
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An object floats with half its volume beneath the surface of the water. The weight of the displaced water is 2000 N. What is the weight of the object? The density of water is 1000 kg/m3
A) 1000 N B) 4000 N C) 2000 N D) It cannot be determined because we do not know the volume of the object.
Spaceship Earth can be self-sufficient in all resources
What will be an ideal response?
The size of a neutron star is
a. about the same as that of our Solar System. b. about the same as that of the Sun. c. about the same as Earth. d. smaller than any of these.
Projectile Motion: In a room where g = 9.81 m/s2, a hockey puck slides off the edge of a platform with an initial velocity of 28.0 m/s horizontally. The height of the platform above the ground is 2.00 m. What is the speed of the puck just before it hits the ground? The air resistance is negligibly small.
A. 48.2 m/s B. 28.7 m/s C. 28.0 m/s D. 26.3 m/s E. 6.26 m/s