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A charged particle (m = 2.0 g, q = -50 µC) moves in a region of uniform field along a helical path (radius = 4.0 cm, pitch = 8.0 cm). What is the angle between the velocity of the particle an
A fisherman and his rowboat have a combined mass of 125 kg. Standing in the motionless boat in calm water, he tosses out a 5 kg rock from the back of the boat, with a velocity of 5 m/s. What will be
The minimum distance required to stop a car moving at 34.0 mi/h is 42.0 ft. What is the minimum stopping distance for the same car moving at 64.0 mi/h, assuming the same rate of acceleration?
An ideal gas at 20 consists of atoms. 7.6 of thermal energy are removed from the gas. What is the new temperature in?
A magnetic computer disk 8.0 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. A small dot is painted on the edge of the disk. The disk accelerates at 600 rad/s^2
The volume of the asteroid, measured from the Galileo images, is 14100 km3. What is the density (mass per unit volume) of the asteroid?
Find the speed relative to Earth of a uniformly moving spaceship whose clock runs 5 s slow per hour compared with an Earth-based clock. Answer in units of c.
Calculate the applied torque needed to accelerate it from rest to 1600 rpm in 6.00 s if it is known to slow down from 1600 rpm to rest in 51.0 s radius is 0.087 m and mass is 0.55 kg.
A student's head is bent over her physics book. The head weighs 50.0N and is supported by the muscle force Fm exerted by the neck extensor muscle and by the contact force Fc exerted at the atlantooc
A dentist uses a small mirror of radius 44 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 13 mm from the tooth, what is the magnification of the image?
A car is negotiating a flat circular curve of radius 50 m with a speed of 20 m/s. The maximum centripetal force (provided by static friction) is 1.2X10^4 N. What is the centripetal acceleration of t
Of the charge Q initially on a tiny sphere, a portion q is to be transferred to a second, nearby sphere. Both spheres can be treated a particles. For what value of q/Q>0.5 will the electrostatic
suppose a block of mass 25.0 kg rests on a horizontal plane, and the coefficient of static friction between the surfaces is 0.220. what is the actual static frictional force that acts on the block i
A 750 Newton's diver drops from a board 12 meters above water's surface, find the diver's speed 5 meters above water's surface.
In a ballistics test, a 25.0g bullet traveling horizontally at 1300m/s goes through a 20.0cm thick 450 kg stationary target and emerges with a speed of 800 m/s. The target is free to slide on a smoo
Find the (a) magnitude and (b) direction of the rocket's acceleration. Give the direction as an angle above the horizontal.
A very long solenoid of circular cross section with radius r= 5.40cm has n= 86.0 turns/cm of wire. An electron is sitting outside the solenoid, at a distance r= 5.90 cm from the solenoid axis. What
A 4.9 block starts at rest and slides a distance d down a frictionless 25.0 incline, where it runs into a spring. The block slides an additional 20.0 before it is brought to rest momentarily by comp
A uniform door weighs 46.0 N and is 1.0 m wide and 2.7 m high. What is the magnitude of the torque due to the door's own weight about a horizontal axis perpendicular to the door and passing through
Use the principle of conservation of linear momentum to determine the common speed of the blocks just after the collision.
What is the minimum thickness of a soap bubble film (n = 1.46) on which light of wave length 500 nm shines, assuming one observes constructive interference of the reflected light?
A 18.8 μF capacitor is fully charged by connecting it to a 16.0 V battery. Calculate the charge stored on one of the capacitor plates.
A 1500 kg car skids to a halt on a wet road where coefficient of friction = 0.46. How fast was the car traveling if it leaves 68m long skid marks?
The resolving power of a microscope is proportional to the wavelength used. A resolution of approximately 5.4 × 10-11 m (0.054 nm) would be required in order to "see" an atom.
A recording engineer works in a soundproofed room that is 45.0 dB quieter than the outside. If the sound intensity in the room is 1.30 10-10 W/m2, what is the intensity outside?