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A woman is standing in an elevator holding her 2.8kg briefcase by its handles. calculate the downward pull of the briefcase on the woman's arm while the elevator is accelerating. Acceleration is downward at 2.5 m/s^2.
A baseball has a velocity of 40.2 m/s (89.9 mi/h), directed horizontally, as it is released by a pitcher. Calculate the ball's instantaneous acceleration just before it is released
A soft tennis ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.51 m. Calculate its velocity just before it strikes the floor
You wind up and throw a 10 kg medicine ball horizontally with a speed of 1.3 m/s directly at your 24-kg little brother. find the common speed of the ball-brother composite
a 70.0 ball of clay is thrown horizontally with a speed of 12.0 toward a 920 block resting on a frictionless surface.
What is the general differential equation for a transverse wave with displacements in the y direction travelling without dissipation in the x direction with velocity v?
A planet follows an elliptical orbit that brings it as close as 21 million km to a star and as far as 90 million km from the star. How fast is it moving when it is closest to the star
A train pulls away from a station with a constant acceleration of 0.42 m/s2. What is the slowest constant speed at which she can run and catch the train
A particle with a charge of -60.0 nC is placed at the center of a nonconducting spherical shell of inner radius 20.0 cm and outer radius 24.0 cm, Calculate the speed of the proton
With a single 150-mH inductor in a circuit with a 60 Hz voltage source, a current of 1.6 Amp is measured on an ac ammeter. Find the phase angle between the current and that voltage
What is the escape speed on a spherical asteroid whose radius is 241 km and whose gravitational acceleration at the surface is 0.492 m/s2
A person holds a 4-kg weight in each hand with arms outstretched while standing at rest on a lightweight platform that is free to turn about a vertical axis. Estimate the person's moment of inertia
A bicycle wheel that has a radius equal to 28cm is mounted at the centre of a 50cm long axle. The tire and rim weigh 30N. Te wheel is spun at 12rev/s and the axle is then placed in a horizontal position by one end resting on a pivot.
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