A cart is moving with a constant horizontal velocity of 5.00 m/s
A small pebble is launched from the front of the cart with a velocity of 8.00 m/s at 60.0° above the horizontal as measured relative to the cart (see figure) and experiences no significant air resistance. Just as the pebble returns to the level from which it was launched, its distance from the front of the cart is closest to
A) 2.83 m.
B) 4.60 m.
C) 5.66 m.
D) 9.19 m.
E) 11.3 m.
Answer: C
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Graphical Analysis: If the position versus time graph of an object is a horizontal line, the object is
A. moving with constant non-zero speed. B. moving with constant non-zero acceleration. C. at rest. D. moving with increasing speed.
Air at a temperature of 32° F has a relative humidity of 60%. If the temperature of the same air rises to 40° F, the relative humidity
a. stays the same. b. increases. c. decreases. d. cannot be determined.
An electron and a proton are each released from rest in the same uniform electric field. The electron moves a distance delectron and the proton moves a distance dproton as each particle's kinetic energy increases by 1.6 eV. How do delectron and dproton compare?
a. delectron < dproton b. delectron > dproton c. delectron = dproton d. The answer depends on the direction of the electric field.
Three long wires parallel to the x axis carry currents as shown. If I = 20 A, what is the magnitude of the magnetic field at the origin?
a.
37 ?T
b.
28 ?T
c.
19 ?T
d.
47 ?T
e.
58 ?T