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A place kicker should kick a football from a point 34 m (about 37 yd) from the goal, and the ball should clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground by a speed of 26 m/s at an angle of 45 degrees to the horizontal.
a) By how much does the ball clear or fall short of clearing the crossbar? The acceleration of gravity is 9.8 m/s^2. Answer in units of m.
b) To decide if the ball approaches the crossbar while still rising or while falling, what is its vertical velocity at the crossbar? Answer in units of m/s.
A torque of 24.0 N m is applied to a solid disk, accelerating itfrom rest to an angular velocity of 140.0 rpm. (The disk has a massof 2.00 kg and a radius of 0.200 m.)
A point charge q of mass m is held a distance from an infinite grounded conducting plane. There is no gravitation. When released, the charge starts to move toward the plane. What is the charge velocity when it hits the plane?
A student notices that 38 mm f11 appears near the lens of an inexpensive camera. What is the focal length of the lens. What is the diameter of the diaphragm opening
A space probe with a rest mass of 8.1×107kg and a speed of 0.50c smashes into an asteroid at rest and becomes embedded within it. what is the rest mass of the asteroid
A satellite with a mass of 310 kg moves in a circular orbit 3.00 107 m above the Earth's surface. What is the gravitational force on the satellite
an electron that has a horizontal initial speed of 4.50 x 106 ms enters a region that has an electric field of 120 vm
A commuter train blows its horn as it passes a passenger platform at a constant speed of 30.0 m/s. The train horn sounds at a frequency of 305 Hz when the train is at rest.
A generator uses a coil that has 80 turns and a 0.40-T magnetic field. The frequency of this generator is 60.0 Hz, and its emf has an rms value of 120 V. Assuming that each turn of the coil is a square (anapproximation), decide the length of the wire..
A child slides down a slide with a 21^\circ incline, and at the bottom her speed is preciselyhalf what it would have been if the slide had beenfrictionless. Calculate the coefficient of kinetic friction between the slide and the child.
A tall tree is growing across a river from you. You would like to know the distance between yourself and the tree as well as its height but you are unable to make the measurements directly. However, by using a mirror to form an image of the tree a..
A woman weighs 180 lb. Determine the following her weight in newtons and her mass in kilograms
in a spherical metal shell of radius r an electron is shot from the center directly toward a tiny hole in the shell
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