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Q. An 8.0 m, 100 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.40, what is the minimum angle that ladder can make with the floor before it slips?
Q. A 68.5- kg ice skater moving to the right with a velocity of 2.89- m/s throws a 0.18 kg snowball to the right with a velocity of 20.6 m/s relative to the ground.
(1) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between skates and ice.
(2) A second skater initially at rest with a mass of 60-kg catches the snowball. What is the velocity of the second skater after catching the snowball in a perfectly inelastic collision?
When a guitar string is sounded along with a 436 Hz tuning fork, a beat frequency of 5Hz is heard. When the same string is sounded along with a 434 Hz tuning fork, beat frequency is 7.00 Hz. What is the frequency of the string.
What is the ratio of the dynamic viscosity of air to that of water at standard pressure and a temperature of 20?C? Find the ratio of the kinematic viscosity of air to that of water for the same condition?
An archer puts a 0.26 kg arrow to the bowstring. An average force of 213 N is exerted to draw the string back 1.3 m. unless otherwise directed, suppose that air resistance is negligible. Illustrate energy bar graphs to solve the problem.
You pull with a force of 295 N on a rope that is attached to the block of mass 20 kg, and the block slides across the floor at a constant speed of 1.2 m/s. The rope makes an angle of 35 degrees with the horizontal.
what is the needed magnitude of the minimum acceleration.
A Ball Rolling Uphill. A bowling ball rolls without slipping up a ramp that slopes upward at an angle beta (B) to the horizontal. Treat the ball as a uniform, solid sphere, ignore the finger holes.
Two speakers, one straight behind the other, are each generating a 285 Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? Suppose that the s..
what speed will the dart leave the gun.
A weightlifter has been given a barbell to lift. One end has a mass of 5.05 kg while the other end has a mass of 5.20 kg. The bar is 0.20 m long. (Consider the bar to be massless, and assume that the masses are thin disks, so that their centers of ma..
An electron starts from rest 5.00 cm from the center of a uniformly charged sphere of radius 4.00 cm. If the sphere carries a total charge of 1.00 x10-9 C, how fast would the electron be moving when it reaches the surface of the sphere.
Two crates, of mass 75 kg and 105 kg, are in contact and at rest on a horizontal surface. A 732 N force is exerted on the 75.00 kg crate.
A board is 6 meters long. The center of mass is in the 2 meters from the left end. The board has a weight of 320 Newton's. How much force in Newtons is necessary to lift the right end while the other end stays on the ground.
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