An object of mass m is suspended by two coplanar wires, as shown below. The tension in each wire has a magnitude given by
a.
d
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The end of a compass needle that points to the south pole of a magnet is the
A) north pole. B) south pole. C) both of these
The law of conservation of energy:
a. fails because energy increases too fast as the speed gets closer to c. b. does not apply to the theory of special relativity. c. applies to the theory of special relativity as long as the relativistic adjustment factor is correctly included. d. applies to any given inertial system but not to others. e. applies to the theory of special relativity in exactly the same form as it applies for small velocities.
What was Chadwick's contribution to public health?
What will be an ideal response?
Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.00 km away from the tower, and the elevator falls from a height of 2.1 × 10^2 m, how long does Superguy have to save Lois, and what must be his average speed?
a. 4.5 s, 200 m/s c. 7.0 s, 140 m/s b. 6.5 s, 150 m/s d. 9.0 s, 110 m/s