A radar pulse is bounced off the Moon at a distance of 400,000 km. What is the time from the transmitting of the pulse until its return?
a. 1.28 s
c. 2.67 s
b. 2.56 s
d. 3.84 s
C
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Projectile Motion: A ball is thrown horizontally from the top of a tower at the same instant that a stone is dropped vertically. Which object is traveling faster when it hits the level ground below if neither of them experiences any air resistance?
A. It is impossible to tell because we do not know their masses. B. the stone C. the ball D. Both are traveling at the same speed.
Two equal masses are raised at constant velocity by ropes that run over pulleys, as shown below. Mass B is raised twice as fast as mass A. The magnitudes of the forces are FA and FB, while the power supplied is respectively PA and PB. Which statement is correct?
?
?
A. FB = FA; PB = PA. B. FB = FA; PB = 2 PA. C. FB = 2 FA; PB = PA. D. FB = 2 FA; PB = 2 PA. E. PA = FA; PB = FB.
Derive the stability criterion for the explicit solution of two-dimensional transient conduction.
GIVEN Two-dimensional transient conduction FIND (a) The stability criterion for an explicit solution
A loop lying in the xy plane conducts a conventional current in the direction shown. What is the direction of the magnetic field at each of points a through f?
A. +x direction
B. -x direction
C. +y direction
D. -y direction
E. +z direction
F. -z direction
T. The field is zero.