In Jules Verne's From the Earth to the Moon, scientists are launched from the surface of Earth by a cannon
With what speed would their capsule have to leave the cannon if the speed of the capsule is required to be zero m/s at the point between Earth and the Moon where their gravitational pulls on the capsule are equal? The mass of Earth is 5.97 × 1024 kg, the mass of the Moon is 7.35 × 1022 kg, the distance between Earth and the Moon is 3.84 × 108 m, the radius of Earth is 6.37 × 106 m, and G = 6.67 x 10-11 N•m2/kg2. A) 11,100 m/s
B) 11,200 m/s
C) 10,400 m/s
D) 15,700 m/s
E) 15,800 m/s
A
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The magnetic compass in an aircraft points to the ______________ pole
a. magnetic north b. magnetic south c. geographic north d. geographic south
A 2.0 kg mass is moving in a circular path with a radius of 5.00 cm. The mass starts from rest and with constant angular acceleration, obtains an angular velocity of 6.00 rad/sec in 3.00 sec. The mass then comes to a stop with constant angular deceleration in 4.00 sec. The centripetal component of acceleration of the mass at 5.00 sec after the start is
A. 2.50 
B. 2.03
C. 1.25
D. 0.980
E. 0.456
Compared to a sound of 30 decibels, the intensity of a sound of 60 decibels is
A) twice as intense. B) 10 times as much. C) 100 times as much. D) 1000 times as much. E) 10,000 times as much.
Which of the following four elements is a neutron-absorbing material used in controlling nuclear reactors?
a. Gold b. Boron c. Iron d. Carbon