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A 80 kg water skier floating in a lake is pulled from rest to a speed of 12 m/s in a distance of 25 m. What is the net force exerted on the skier, assuming his acceleration is constant?
There is a 0.275 T magnetic field directed along the +x axis and a field of unknown magnitude along the +y axis. A particle carrying a charge of 7.10 10-5 C experiences a maximum force of 0.455 N w
An osprey calls while diving at you, to drive you away from her nest. You hear the call at 2220 Hz. How fast is the osprey approaching?
At a certain location, the horizontal component of the earth's magnetic field is 2.2 10-5 T, due north. A proton moves eastward with just the right speed, so the magnetic force on it balances its we
In a hydroelectric installation, a turbine delivers 1900 hp to a generator. Under these conditions, what current will the generator deliver at a terminal potential difference of 1030 V?
While rearranging a dorm room, a student does 304 J of work in moving a desk 3.1 m. What was the magnitude of the applied horizontal force?
A 17 g rifle bullet traveling 235 m/s buries itself in a 3.7 kg pendulum hanging on a 3.0 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal compon
What is the mass of the string, observed wave speed is 16m/s when the suspended mass is 3.0kg
The sun shines on a thin so that a 440 nm blue light is seen reflecting off the film. What is the minimum thickness of the film?
An 18 g rifle bullet traveling 210 m/s buries itself in a 3.6 kg pendulum hanging on a 2.7 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal compo
A 65 kg woman and a 85 kg man stand 14.5 m apart on frictionless ice. If they hold on to the two ends of a rope, and the man pulls on the rope so that he moves 2.4 m, how far from the woman will he
Find a. the speedd of the disk's center of mass when it reaches the bottom of the ramp and b. the angular speed of the disk at the bottom of the ramp.
Particle 1 of charge 1 µC and particle 2 of charge -3 µC are held at separation L = 10cm on an x-axis. What must be the x and y coordinates of particle 3?
If the coefficient of kinetic friction is 0.20, how much work was done by the worker's force?
What is the mass of an ice cube, taken from a -19.0^circ C freezer, that will cool your coffee to a pleasant 59.0^circ?
He holds a flashlight between his feet and manages to point it at the mirror. At what angle of incidence must the light strike the mirror so the light will reach his eyes?
A constant torque of 21.4 N·m is applied to a grindstone whose moment of inertia is 0.125 kg·m2. Using energy principles, calculate the angular speed (in revolutions per second) after
In the determination of the volume of the irregularly shaped object, any air bubbles sticking to the surface of the object when it is submerged cause systematic error. Will this error give an exper
What is the radius of the turn if theta = 20.0 degrees (assuming the car continues in uniform circular motion around the turn)?
A alpha particale has a mass 6.64× 10^27 kg and a charge of + 2e What the magnitude and direction of the electric field that will balance the gravitational force on the particale?
A 0.250 kg block on a vertical spring with a spring constant of 500x 10^ N/m is pushed downward, compressing the spring 0.100m. when released, the block leaves the spring and travels upward vertical
How much energy is lost per second when the steam is at 200°C and the surrounding air is at 20.0°C? The pipe has a circumference of 800cm and a length of 50.0m.
It has been suggested that rotating cylinders about 12 mi long and 3.9 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal ac
An automobile traveling at 15.0km/h along a straight, level road accelerates to 67.0km/h in 6.20s . What is the magnitude of the auto's average acceleration?
A person pushes on the outer edge of one pane with a force of F = 51 N that is directed perpendicular to the pane. Determine the magnitude of the door's angular acceleration.