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A barefoot field-goal kicker imparts a speed of 21 m/s to a football initially at rest. If the football has a mass of 0.3 kilogram and the time of contact with the ball is 0.011 second, find the force exerted by the ball on the kicker foot?
Answer in units of N.
Kenny throws a basketball which has an initial speed v0. When the ball gets to its mininum speed sometime before striking the ground, What was the initial angle of the ball
A net force of 36N accelerates a 5.1-kg mass over a distance of 12 m. What is the increase in kinetic energy of the mass
In a Young's experiment using sodium light (λ = 589 nm), the slits are 1.2 µm wide. You notice that fringes 4, 8, etc. are missing. How many fringes appear on the screen
An initially neutral conductor contains a hollow cavity in which there is a -100 nC point charge. what is the charge on the inner wall of the cavity wall
A brave child decides to grab on to an already spinning merry-go-round. What is the moment of inertia of the merry-go-round with respect to its central axis
An arrow has a velocity of 45.0 m/s when it reaches a straw target. estimate its average acceleration while coming to rest
The other end is attaced to a 3 kg disk moving in uniform circular motion on the table, which stretches the spring by 1 cm. Note: Friction is negligibe. Illustrate what is the work done on the disk by the spring during one full circle?
Calculate the minimum wavelength x-ray that can be produced when a target is struck by an electron that has been accelerated through a potential difference of 10.7 kV
A resistor and capacitor are connected in series with an applied AC voltage source. What is the effective (rms) voltage of the source
The centripetal and tangential accelerations are equal
A certain type of radio antenna is called a quaterwavelength antenna, because its length is equal to one quarter of the wavelength to be received. what lengths of wire would you use
A laser produces an average power of 5.5 W in a light beam 1.0 mm in diameter. Find the peak electric field of the laser light
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