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A weight lifter does a series of arm raises while holding a 7.50 kg weight. Her forearm (including the hand) starts out horizontal and pivots to a vertical position about her elbow. The mass of the lower arm plus hand is 5.00 kg, uniformly distributed along its 35.0cm length.
With each arm raise, by how much does the center of mass of her forearm (including her hand and the weight) rise?
What is the change in its gravitational potential energy with each arm raise?
A parallel-plate capacitor is formed from two 1.0 {rm cm} times 1.0 {rm cm} electrodes spaced 2.4 {rm mm} apart. The electric field strength inside capacitor is 1.0times10^{6};{rm{N/C}}.
Suppose a space colony is established on the moon. how much time will the clock on the moon lag the clock
A magnetic field near the ceiling points up and is decreasing. Looking up at the ceiling, does non-Coulomb electric field curl clockwise or counter-clockwise.
An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is = 1.42 × 109 W/m2. find the magnetic field in the electromagnetic wave emitted by the lase
A 958 N Rocket is coming in for a vertical landing. It starts with a downward speed of 25 m/s, What must be the direction of the engine thrust force
The fundamental frequency of a closed pipe is 108 Hz. Find the next higher harmonic for this tube
Determine the moment of inertia for three children weighing 64.0 lb, 43.0 lb and 83 lb sitting at different points on the edge of a rotating merry-go-round, which has a radius of 12 ft.
Cyclotrons are sometimes used for carbon-dating by accelerating singly ionized C14 and C12 ions from a sample of material. find the difference in cyclotron frequencies for the two ions
A ski jumper leaves the ski track moving in the horizontal direction with a speed of 25.0 m/ s. Obtain the velocity when the jumper lands
A 65-g ice cube at 0°C is placed in 665 g of water at 30°C. What is the final temperature of the mixture
A photon of green light (wavelength = 532 nm) and a Ping-Pong ball (mass = 2.90 10-3 kg) have the same momentum
The jumping squirrel. A squirrel wants to jump from a point A on a branch of a tree to a point B on another branch. The horizontal distance from A to B is x = 5 ft, and the vertical distance is y = 4 ft. If the squirrel jumps with an initial speed..
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