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Q.A child applies a force vec F parallel to the x-axis to a 10.0-rm kg sled moving on the frozen surface of a small pond. As the child controls the speed of the sled, the x-component of the force she applies varies with the x-coordinate of the sled. Suppose the sled is initially at rest at x=0. You can ignore friction between the sled and the surface of the pond. Use the work-energy theorem to find the speed of the sled at 3.0 m.
Q. A 50.0 ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.50 turns each second. The distance from one hand to the other is 1.5 . Biometric measurements indicate that each hand typically makes up about 1.25 of body weight.
Estimate the change in COP of your electric food freezer when it is removed from your kitchen to its new location in your basement, which is 8 C° cooler than your kitchen. (Assume that the temperature in the kitchen is 20°C and that the temperature o..
Two narrow slits 41 µm apart are illuminated with light of a wavelength 604 nm. What is the angle of the m=3 bright fringe in degrees.
Two masses traveling at the same speed v0 collide head on. Nothing is known about collision other than that it is not completely inelastic.
Determine the location at which the tuning is formed and the vibrating frequency of a string to form a standing wave pattern.
A crate of mass 10.3 kg is pulled up a rough incline with an initial speed of 1.51m/s. The pulling force is 97N parallel to the incline, which makes an angle of 20.3 ° with horizontal. The coefficient of kinetic friction is 0.400, and the crate is..
What is the frequency of ultrasound in a medium if he wave length is 3.0 x 10^-3 m and velocity is 1300 mm/ms.
A 6 ornament is hanging by a 1.30 wire when it is suddenly hit by a 3.00 missile travelling horizontally at 10.0. The missile embeds itself in the ornament throughout the collision.
A ball of mass 0.113 kg is dropped from a height of 1.92m above ground. The acceleration of gravity is 9.8m/s^2.Neglecting air resistance find the speed of the ball when it is at a height of 0.812 m above the ground. Answer in units of m/s.
A 2500-kg sport utility vehicle travelling at 92 km/h can be stopped in 0.25 s if it hits a concrete wall. Assume a 60 kg person was in the car that hit this wall. The velocity of the person equals that of the car both before and after the crash, and..
Both systems start from rest, and the direction of the force moves with the system and always points along the 4.00 m rod. What is the angular velocity of each system after 5.28 s.
Travelling at the speed of 14.10 m/s, driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.650. What is the speed of automobile after 1.130 s have elapsed..
The displacement of an object moving under uniform acceleration is some function of time and the acceleration. Suppose we write this displacement as s=ka^mt^n, where k is the dimensional constant. Show by dimensional analysis that this expression ..
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