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a barefoot field-goal kicker imparts a speed of 42 meters per second to a football initially at rest. if the football has a mass of .43 kg and the time of contact with the ball is .034 seconds, what is the force exerted by the ball on the kicker's foot? answer in units of newtons.
A parallel plate capacitor has a separation between its plates of 1.0 mm. There is a dielectric with a dielectric constant of 2.1 fi ling the gap. what is the area of one of the capacitor plates
The bones of a saber-toothed tiger are found to have an activity per gram of carbon that is 15.3% of what would be found in a similar live animal. How old are these bones (in years)
A 5.1kg mass hanging from a spring scale is slowly lowered onto a vertical spring, as shown in the figure(Figure 1) . a.) What does the spring scale read just before the mass touches the lower spring? b.) The scale reads 25 when the lower spring has ..
A uniform chain of total mass m is laid out straight on a frictionless table and held stationary so that one-quarter of its length, L = 2.85 m, Determine the speed of the chain
in an effort to pump up you decide to hit the gym and lift weights everyday of the week. your favorite lift which you
The activity (decays per second) of a certain radionuclide is observed to decrease by 87.5% in 30 hours. What is the half life T(1/2) of the radionuclide
the earth rotates once per day about an axis passing through the north and south poles an axis that is perpendicular to
Two 30 kg masses have velocities (in m/s) of vector v 1 = 10 i(hat) - 20 j(hat), Determine the velocity of the center of mass of the system
A 0.20 g of hydrogen gas are help in a rigid container. The temperature of the gas is changed from 50 K to 80 K. How much heat is needed
An electron enters a region of constant electric field that is produced by a parallel-plate capaci- tor, find the velocity of the electron when it exits the capacitor
The rotor (flywheel) of a toy gyroscope has mass 0.150 kg. Its moment of inertia about its axis is 1.20x10^-4kgm^2. Find the upward force exerted by the pivot
A solid, uniform disk of radius 0.250 m and mass 45.1 kg rolls down a ramp of length 5.20 m that makes an angle of 13.1° with the horizontal. Find the speed of the disk's center of mass when it reaches the bottom of the ramp
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