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A circus act involves a trapeze artist and a baby elephant. They are going to balance on a teeter-totter that is 10 meters long and pivoted at the middle. The lady has a weight of 500 newtons and is standing on one end. The elephant has a weight of 2,500 N and is walking toward her on the beam. How far does the elephant have to walk to balance the beam?
A uniform rod of length 0.790 m and mass 14.50 kg is balanced on a sharp edge at 0.650 m from the left end. At the left end hangs a mass of 45-kg and the right end hangs an unknown mass so that the whole assembly is in equilibrium.
a cylinder of radius 3.34 cm and a sphere of radius 8.47 cm are rolling without slipping along the same floor. the two
a ball of mass 8.0 g with a speed of 20.5 ms strikes a wall at an angle 21.0o and then rebounds with the same speed and
A ray of light passes from air into water. The incident angle is 30o. Find the index of refraction of water if the angle of refraction is 22o
Any change of the energy of a system occurs because of
The middle C string on a piano is under a tension of 944N. The period and wavelength of a wave on this string are 3.82 ms, calculate the linear density of the string
A rocket (in frame S') is moving at a speed v = 4c/5 relative to the moon (frame S). At t' = 2×10-7 s a UFO appears at a point x' = 10m traveling in the x' direction with constant velocity u' = -c/2. What was the velocity of the UFO
In t-ball, young players use a bat to hit a stationary ball off a stand. The 140 g ball has about the same mass as a baseball, but it is larger and softer. What is the acceleration of the ball
A 11.7-m-radius Ferris wheelrotates once each 32 s. What is the linear speed of a passenger
a proton gun fires a proton from midway between two plates a and b which are separated by a distance of 71.0 cm the
An ideal transformer has 890 turns in its primary coil and 150 turns in its secondary coil. What is the output voltage of the secondary coil
At t = 0, one toy car is set rolling on a straight track with initial position 15.5 cm, initial velocity -2.9 cm/s, and constant acceleration 2.10 cm/s2. What are their speeds at that time
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