How many exoplanets are there in the Solar System?
A. 100 billion
B. at least 2000
C. 0
D. 8
Answer: D
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The Carboniferous Period began about
A) 475 million years ago B) 65 million years ago C) 360 million years ago D) 542 million years ago
Two blocks are accelerated across a horizontal frictionless surface as shown. Frictional forces keep the two blocks from sliding relative to each other, and the two move with the same acceleration. If F = 1.2 N and M = 1.0 kg, what is the horizontal component (frictional force) of the force of the large block on the small block?
A. 0.40 N to the left B. 0.80 N to the right C. 0.40 N to the right D. 0.80 N to the left E. 1.20 N to the left
A 1.5-kg cart attached to an ideal spring with a spring constant of 20 N/m oscillates on a horizontal, frictionless track
At time t = 0.00 s, the cart is released from rest at position x = 10 cm from the equilibrium position. (a) What is the frequency of the oscillations of the cart? (b) Determine the maximum speed of the cart. Where does the maximum speed occur? (c) Find the maximum acceleration of the mass. Where does the maximum acceleration occur? (d) How much total energy does this oscillating system contain? (e) Express the displacement as a function of time using a cosine function.
Two point charges each have a value of 35.5 mC and are separated by a distance of 4.0 cm. What is the electric field midway between the two charges? (ke = 8.99 × 10^9 N·m2/C2)
a. 7.1E+8 N/C b. 3.5E+8 N/C c. 1.8E+8 N/C d. zero e. 2.0E+8 N/C