A ruby laser beam (? = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the moon, 384,000 km away. What is the radius of the big red spot on the moon?

a. 500 m
b. 250 m
c. 120 m
d. 1.0 km
e. 2.7 km


c

Physics & Space Science

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Which of the following describes a velocity (as opposed to a speed)?

A) 20 kilometers per hour, headed north B) 300,000 kilometers per second C) 9.8 meters per second squared (m/s2) D) 15 newtons E) 5 light-years

Physics & Space Science

About what percentage of Hubble Deep Field (HDF) galaxies do astronomers find are irregular?

A: 5%. B: 25%. C: 50%. D: 70%. E: 90%.

Physics & Space Science

The exterior of a supersonic airplane is made of aluminum, which has a coefficient of linear expansion of 24 × 10-6 K-1. At 15°C, the plane measures 62.1 m in length

When the plane is in flight, friction with the air increases the temperature of the exterior skin to 200°C. What is the change in the length of the outer skin of the plane? A) 32 cm B) 20 cm C) 36 cm D) 24 cm E) 28 cm

Physics & Space Science

Frost wedging is a form of

a) terminal erosion. b) physical weathering. c) chemical weathering. d) slow mass wasting.

Physics & Space Science