Which object has the most kinetic energy?
A) a 4-ton truck moving 50 km/hr
B) a 3-ton truck moving 70 km/hr
C) a 2-ton truck moving 90 km/hr
D) a 1-ton truck moving 110 km/hr
E) A, B, C, and D all have the same kinetic energy.
C
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A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 20.0 radians per seconds, then the frequency of the rotational motion is
A. 4.00 Hz. B. 3.67 Hz. C. 3.18 Hz. D. 2.83 Hz. E. 2.15 Hz.
How many turns should a 10-cm long solenoid have if it is to generate a 1.5 × 10-3 T magnetic field on 1.0 A of current?
A) 12 B) 15 C) 120 D) 1200 E) 3200
An electric motor can be manually turned and made to act as a generator
Indicate whether the statement is true or false
Will the Sun ever turn into a brown dwarf? Why or why not?
What will be an ideal response?