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A pitcher throws a 0.15 kilogram ball so that it crosses home plate horizontally with a speed of 20 m/s. The ball is hit straight back at the pitcher with a final speed of 29 m/s. (Assume the direction of the initial motion of the ball to be positive.)
(a) Estimate the impulse delivered to the ball?
kg•m/s
If you hold a 400 cm^2 square plane mirror 43cm from your eyes and can just see the full length of an 8.1m falgpole behind you
A pipe has a narrow end compared to the other end. The area of the narrow section is one-half the area of the wide section. find the velocity of the water in the wider section
A .5 kg block rests on a horizontal frictionless surface. It faces toward an inclined surface. How fast is the block going at that max height
Two particles, each of mass M, are hung between three identical springs. Each spring is massless and has spring constant K. Neglect gravity. The masses are connected as shown to a dashpot of negligible mass.
q1. an antelope moving with constant acceleration covers the distance 79.0 m between two points in time 6.70 s. its
Frames k and k' are inertial frames. Frame k' is moving at a velocity of magnitude v realtive to frame k in the direction of the x-axis. there are rigid rods in each frame oriented along the direction of the relative velocity. someone in frame k meas..
Scientists in a laboratory produce a sound wave in a simulated environment (air) with a velocity of 473 m/s
A tuning fork is sounded above a resonating tube (one end closed) which resonates at a length of 0.32 m, What is the frequency of the fork
The multiplicity for a particular system is ?= exp(N^2V^3U^1/2/?), where gamma is a constant to give correct units, V is the volume, N is the number of particles, and U is the energy. What is the system's entropy, temperature, chemical potential, pre..
A 73 kg parachutist descends during a vertical height of 420 m with constant speed. Find the increase in entropy produced by the parachutist; assume the air temperature is 21°C.
Calculate each of the following if the electrons exit the field with a speed of 4.45x10^6 m/s and distance between the plates is 2.07 cm.
The train passes point A with a speed of 30 m/s and begins to decrease its speed at a constant rate of at = -0.25 m/s2. Determine the magnitude of the acceleration of the train
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