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a 20 kg mass sits on an inclined plane with friction making an angle of 50 degrees with respect to the horizontal. calculate the frictional force required to keep the mass from sliding down the incl
a diver runs horizontally with a speed of 1.2 m/s off a platform that is 5.0 m above the water. What is the speed just before striking the water
A 230g baseball is pitched at 42m/s spinning at 40rad/s . You can treat the baseball as a uniform solid sphere of radius 4.0cm
a boy pulls a loaded wagon having a total mass m=100kg. He applies a constant force F=100N along the handle at 30 degrees, compute the horizontal force on the wagon
Galileo dropped a ball from the tower of Pisa. The ball hit the ground in 3 seconds. what was the speed on striking the ground
The antenna for an AM radio station is a 75-m-high tower that is equivalent to one-quarter wavelength, At what frequency does the station transmit
To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) at high speed. What was the raven's speed right after the collision
In Europe, the standard voltage is 240 V (rms), AC, and 50 cycles/s. Suppose you take your 5.00 W electric razor to Rome and plug it into the receptacle, What is the resistance of your razor
A helium-neon laser of the type often found in physics laboratories has a beam power of 4.00 mW at a wavelength of 633 nm. Calculate the force exerted on this sphere
A bat strikes a 0.145-kg baseball. Just before impact, the ball is traveling horizontally to the right at 60.0m/s, Find the horizontal component of the average force on the ball. Take the x-direction
How many energy is consumed by a 1.10kW hair dryer used for 11.0min and a 10.0W night light left on for 11.0hr
What is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields
An ideal spring with a spring constant of 16 N/m is suspended vertically. What is the extension of the spring when the speed is a maximum
A 1.9cm × 1.9cm × 1.9cm box with its edgesaligned with the xyz-axes is in the electric field E? =(360x+150)i^N/C, where x is in meters
Gas is contained in a 6.00-L vessel at a temperature of 21.0°C and a pressure of 8.00 atm. Determine the number of moles of gas in the vessel
What is the wavelength of an 102.1 FM radio station and What is the wavelength of an 1310 AM radio station
A 330-power compound microscope has a 4.9mm focal-length objective lens. If the distance from eyepiece to objective is 12cm, what should be the focal length of the eyepiece
You are with 11 other people on a boat at rest in frictionless water. The group's total mass is 858kg, How far does the boat move
A helium-neon laser of the type often found in physics laboratories has a beam power of 4.00 mW at a wavelength of 633 nm. Calculate the intensity of the focused beam
An inductor with an inductance of 2.90H and a resistor with a resistance of 6.00? are connected to the terminals of a battery with an emf of 4.00V, Find the initial potential difference across the i
A transformer is constructed that has 120 turns of wire on the primary side and 430 turns of wire on the secondary (load) side. what is the AC current measured on the secondary side
person 1.6 m tall stands 5.2 m from a reflecting globe in a garden. How large is the person's image
A candle is placed 1.270m in front of a converging lens. The image of the object is focused on a screen 1.376m behind the lens. What is the magnification of the image
To focus a camera on objects at different distances, the converging lens is moved toward or away from the film, Over what distance must the lens be movable