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Q. A barefoot field-goal kicker imparts a speed of 31 m/s to a football initially at rest. The acceleration of gravity is 9.8 m/s2. What is the height of the tower?
Q. During the late 19th and early 20th centuries, direct observations showed that a glacier in Switzerland flowed forward in the downhill direction while its snout (terminus) was retreating higher up the valley? Which of the following explains these observations in a rational, scientific way?
What is the focal length of this mirror. If the object is 25 cm in front of the mirror, what is the image distance.
The position of an air-track cart that is oscillating on a spring is given by the equation x = 12.4 cos[(6.35 s-1)t] . At what value of t after t= 0.00s in the cart first located at x = 8.47 cm ?
A man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless, frictionless pulley and back down to the man's hand. The combined mass of the man and chair is 86 kg. With what force magnitude should the man pull on ..
The pilot of an aircraft wishes to fly due west in a 37.70 km/h wind blowing toward the south. The speed of the aircraft in the absence of the wind is 191 km/h.
A proton starting from rest is accelerated in a cyclotron to a speed of 3.0•106 m/s. Find the work done on a proton by the electrical force of the cyclotron.
A 3.00 kg mass resting on a level table top is pulled along by a horizontal force of 16 N and accelerates at 4.00 meters per second per second. What is the force of friction between block and table.
What is the total flux
Two charges are placed on the x axis. One of the charges q1= +8.5 C is at x1 = + 3.0 cm and the other q2= -21C is at x1 = + 9.0 cm. Find the net electric field (magnitude and direction) at.
Intuitively, the man will not catch the bus unless he is running fast enough. In mathematical terms, there is a constraint on the man's speed so that the equation above gives a solution for that is a real positive number.
What least number of grooves is required for a grating
An airplane is flying in a horizontal circle at the speed of 542 km/h. If the wings of the plane are tilted 33.0° to the horizontal, what is the radius of the circle in that the plane is flying? Suppose that the required force is provided entirely by..
A grindstone of radius 4 m is initially spinning with an angular speed of 8 rad/s. The angular speed is then increased to 10 rad/s over the next 4 seconds. Imagine that the angular acceleration is constant.
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