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A cement block accidentally falls from rest from the ledge of a 82.4 -m-high building. When the block is 19.9 m above the ground, a man, 1.70 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have to get out of the way?
One runner ran the 100-m dash in 11.9 s. Another runner came in secona at 12.4 s. Assuming that the runners traveled at their average speeds for the entire distance, determine the sepaaration between the two runners when the winner crossed the fin..
A person whose eyes are 1.75m above the floor stands in front of the plane mirror. The top of her head is 0.11.
Two tiny conducting spheres are identical and carry charges of -18.2 ?C and +50.3 ?C, What is the magnitude of the force that each sphere experiences
Just before the collision and in kilometers per hour, what was the speed of the rocket piece relative to the satellite if both were in circular orbits and the collision was (a) head-on and (b) along perpendicular paths.
Starting from rest with an acceleration of 0.37 m/s2, he covers the same distance as the ramp does, but in one-fourth the time. Illustrate what is the speed at which the belt of the ramp is moving?
After the ambulance passes, the observed frequency of the siren is 493 Hz. Conclude the ambulance's speeds from these observations.
A wave has a speed of 500.0 m/s and a wavelength of 4.9 m. What is the frequency of the wave? What is the period of the wave?
A child goes down a playground slide with an acceleration of 1.22. Find out the coefficient of kinetic friction between child and slide if the slide is inclined at an angle of 31.0 below the horizontal.
A rifle is aimed horizontally at a target 54.0m away. The bullet hits the target 2.60cm below the aim point, What was the bullet's flight time
A gasoline engine has a power output of 155kW (about 2.08×105hp ), Its thermal efficiency is 26.0%, How much heat must be supplied to the engine per second
Two 12-cm-diameter charged rings face each other, 17.0 apart. Both rings are charged to + 40.0. What is the electric field strength at the midpoint between two rings.
An alpha particle and beta^ {-} particle, each with kinetic energy 35 {rm keV}, are sent through a 1.10 {rm T} magnetic field. The particles move perpendicular to the field. Find the curvature radius for alpha particle's trajectory. Hint: The kine..
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