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Q. A dentist uses a small mirror of radius 52 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 resulting image?
Q. A chair of weight 70 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 37.0 directed at an angle of 42 below the horizontal and the chair slides along the floor.
A fan at a rock concert is 35m from the stage, where sound intensity level is 125 dB. Her eardrums have a diameter of 8.07mm. How much energy is transferred to each eardrum in one second? (Distance from the speaker to the edge of the stage is 1 m...
A projectile is fired at an upward angle of 50° from the top of a 145m cliff with a speed of 195 m/s. What will be its speed while it strikes the ground below? (Use conservation of energy.)
A flywheel in a motor is spinning at 560 when a power failure suddenly occurs. The flywheel has mass 40.0 and diameter 75.0. The power is off for 34.0, and during this time the flywheel slows down uniformly due to friction in its axle bearings. Durin..
A motorcyclist is able to ride on the vertical wall of a bowl- shaped track . his weight is counteracted by the friction of the wall on the tires. what force increase or decrease if he rides faster.
A 61.0 kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12.0 m .If the skier's speed at point A is 7.50 m/s (before entering dip), what is the normal force exerted by the snow on the skie..
A bartender slides a beer mug at 1.30 m/s towards a customer at the end of a frictionless bar that is 2.0m tall. The customer makes a grab for the mug and misses, and the mug sails off the end of the bar.
Question on center of gravity Discover speed of each block
Two trains, each having a speed of 38 km/h, are headed at each other on the identical straight track. A bird that can fly 70 km/h flies off the front of one train while they are 68 km apart and heads directly for the other train. On reaching other tr..
A hockey stick is swung with an average angular acceleration of 1.5 rad/s2. What is an angular velocity of the stick when it strikes the ball at the end of 0.8 second swing.
Coherent light with wavelength 592 nm passes through two very narrow slits, and interference pattern is observed on the screen a distance of 3.00 {rm m} from the slits. The first-order bright fringe is the distance of 4.84 {rm mm} from the center o..
The electron gun in a TV picture tube accelerates electrons between two parallel plates 1.5cm apart with a 27 kV potential difference between them.
An airplane is flying with a velocity of 86.0 at an angle of 23.0 above the horizontal. When the plane is a distance 114 straight above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.
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