A projectile is fired at an angle above the horizontal at a location where g = 9.8 m/s2. The initial x and y components of its velocity are 86.6 m/s and 50 m/s respectively. At what angle was the projectile fired above the horizontal?
A) 45°
B) 60°
C) 30°
D) 90°
E) 75°
C
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A 4.00 kg ball is traveling at 5.00 m/s and strikes a wall. The 4.00 kg ball bounces off the wall with a velocity of 4.0 m/s. The change in momentum of the ball is
A. 8.0 kg m/s. B. 13 kg m/s. C. 26 kg m/s. D. 30 kg m/s. E. 36 kg m/s.
Water flows through a pipe. The diameter of the pipe at point B is larger than at point A. Where is the speed of the water greater?
A) point A B) point B C) same at both A and B D) Cannot be determined from the information given.
A boxcar of mass 200 tons at rest becomes uncoupled on a 1.5° grade. If the track is considered to be frictionless, what speed does the boxcar have after 10 seconds?
a. 0.37 m/s b. 0.59 m/s c. 2.6 m/s d. 4.3 m/s
Equal charges, one at rest, the other having a velocity of 104 m/s, are released in a uniform magnetic field. Which charge has the largest force exerted on it by the magnetic field?
a. The charge that is at rest. b. The charge that is moving, if its velocity is parallel to the magnetic field direction when it is released. c. The charge that is moving if its velocity makes an angle of 45o with the direction of the magnetic field when it is released. d. The charge that is moving if its velocity is perpendicular to the magnetic field direction when it is released. e. All the charges above experience equal forces when released in the same magnetic field.