What are the standard units for luminosity?

A) Watts
B) Newtons
C) Joules
D) kilograms
E) Watts per second


A

Physics & Space Science

You might also like to view...

Strictly speaking, the sum of the angles on a triangle equals 180 degrees

A) in flat space. B) on a spherical surface. C) on a saddle-shaped surface. D) all or any of the above E) none of the above

Physics & Space Science

A spaceship approaches Earth with a speed 0.38c. A passenger in the spaceship measures his heartbeat as 72 beats per minute

How many beats per minute are observed in the telemetry radio signals received on Earth? Note that, in addition to time dilation, one must take into account that the signals of successive heartbeats have to travel shorter distances because the spaceship is moving closer (Doppler Effect). A) 75 B) 107 C) 48 D) 100 E) 67

Physics & Space Science

A 120-V rms signal at 60 Hz is applied across a series combination of a 30-mH inductor and a 100-? resistor. What is the rms value of the current in this circuit?

A) 1.2 A B) 1.8 A C) 0.80 A D) 1.6 A E) 1.4 A

Physics & Space Science

A child bounces a 50-gram superball on the sidewalk. The velocity of the superball changes from 21 m/s downward to 19 m/s upward. If the contact time with the sidewalk is 1/800 s, what is the magnitude of the force exerted on the superball by the sidewalk?

Physics & Space Science