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A beam of hydrogen molecules (H2) is directed toward a wall, at an angle of 58° with the normal to the wall. Each molecule in the beam has a speed of 1.5 km/s and a mass of 3.3 x 10-24 g. The beam strikes the wall over an area of 3.8 cm2, at the rate of 1021 molecules per second. What is the beam's pressure on the wall?
A wire of radius R carries a current with density: J =C(R-r). Find the total current carried by the wire
A light-bulb of power 40 Watts is operating with a potential difference of 120 V across it. What is the current and resistance of the filament
A scaffold of mass 57 kg and length 6.5 m is supported in a horizontal position by a vertical cable at each end. What is the tension in the cable closer to the painter
An object with a height of 42 cm is placed 2.2 m in front of a concave mirror with a focal length of 0.45 m. Determine the location and magnification of the image produced by the mirror, using the mirror and magnification equations.
A boy catches - with bare hands and his arm extended - a 0.16 kg baseball coming directly toward him ar a speed of 25 m/s. what is the average force the boy's hand feel while catching the ball
A motorist drives south at 28.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.20 min, find the average velocity and degree south of west
A hypothetical 40cm long arm is assumed to be weightless. What is the maximum weight that can be held in the hand if the muscle is attached 1 cm from the below
A baseball outfielder throws a 0.15 kg baseball at a speed of 40 m/s and an initialangle of 30?. What is the kinetic energy when it hits the ground
Calculate the acceleration of a skier heading down a 10.0 deg, slope, assuming the coefficient of friction for waxed wood on wet snow
When the Sun is straight overhead, a hawk dives toward the ground with the constant velocity of 4.50 m/s at 52° below the horizontal. Compute the speed of her shadow on the level ground.
q. a 30 gram mass is hanging from a spring whose unstretched length is 20 cm and whose spring constant is 2.5 nm. in
q1. the pulley system is used to lift a 52 kg crate. note that one chain connects the upper pulley to the ceiling and a
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