It takes Neptune a longer time to orbit the Sun than Earth does because Neptune
A) has much further to go.
B) goes much slower.
C) both of these
D) none of these
Answer: C
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A satellite is in a circular orbit about the Earth at a distance of d = 5 times the Earth's radius above the surface. What is the speed of the satellite? (The radius of the Earth is 6.4 × 10^6 m.)
a. 4.2E+2 m/s b. 1.3E+5 m/s c. 3.2E+3 m/s d. 3.3E+6 m/s
A 2.00 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 deceleration in 4.00 sec. The centripetal component of acceleration of the mass at 2.00 sec is
A. 1.220 
B. 0.980
C. 0.806
D. 0.656
E. 0.520
The density of aluminum is 2700 kg/m3. If transverse waves propagate at 34 ,s in a 4.6-mm diameter aluminum wire, what is the tension on the wire?
A) 52 N B) 31 N C) 42 N D) 62 N
The case of Mars tells us that which of the following is a critical factor in determining surface habitability?
A) planetary size B) levels of geological activity C) distance from the Sun D) the presence of a magnetic field