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Question
Usain Bolt of Jamaica set a world record in 2009 for the 200-meter dash with a time of 19.19 seconds. What was his average speed? Give your answer in meters per second and miles per hour.
Calculate in milligrams the kinetic energy for each train (1/2)mv2 before the collision (1 milligram= 10-3 gram= 10-6 kilogram.
A cart is attached to a hanging mass by a string that passes over a pulley. Write an equation for the work done by friction when the cart is moving up the track at constant speed
An electron is placed in a region with a constant, uniform electric field pointing in the positive x direction. In what direction is the electric force on the electron
a hamster gets on a stationary wheel with radius 0.15 m and runs until wheel rotates at angular speed of 12.0 rad/s in 4.0 s What is tangential acceleration of wheel's edge
Consider the circuit shown in (Figure 1) . Suppose thatE = 24V . What is the current through the battery when the switch is open?
You're carrying a 3.6-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35cm from its tip.
A stationary particle in space decays into three fragments. One of the fragments is observed to have a momentum of kg m/s and another has momentum kg m/s just after the decay. The final particle is invisible to the detector and so its momentu..
A laser emits light at wavelength ? = 637 nm in a beam of diameter 2.9 mm and at an energy-emission rate of 5.4 mW. At what rate per unit area does the detector absorb photons
It is observed that when the particle is at its highest point during the motion, its distance below O is A1/2 L0. Using the law of conservation of mechanical energy, find the distance, in m, of the particle below O when it is at its lowest point d..
A product enters a tunnel dryer with 56% moisture content (wet basis) at a rate of 10 kg/h. The tunnel is supplied with 1500 kg dry air/h at 50°C and 10% RH, and the air leaves at 25°C in equilibrium with the product at 50% RH. Determine the moist..
A 0.55 kg book moves vertically upwarda distance of 10 m, and thenvertically downward 10 m, returning toits initial position. How much work is done by gravity during the upwardmotion of the book
Explain how much force must you exert to keep the pole motionless and horizontal?
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