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Q. As a car approaching you driver lays on the horn. The horn has an actual frequency of 350 Hz but you hear the horn as 390 Hz. What is the speed of the car?
Q. Two uncharged metal balls, X and Y, stand on glass rods, and are in touch with each other. A third ball Z carrying a negative charge, is brought near the first two (closer to Y). While the positions of these balls are fixed, ground the ball X and then break the grounding. While X and Y remain in touch, remove Z. Then separate X and Y. What are the charges on each of the balls?
A sanding disk with rotational inertia 2.4 10-3 kg•m2 is attached to an electric drill whose motor delivers a torque of 8 N•m about the central axis of the disk. What are the following values about the central axis at the instant the torque has been ..
What is the shortest height a plane mirror must be so that a person who is 1.6 meters tall is able to see his or her whole body? plan a ray diagram to support your answer.
Which of the planets fits the following description: "a solid, cool surface, with occasional dust clouds and a thin CO2 atmosphere".
Note the gravitational acceleration of equatorial sea level is g = 32.0088ft/s^2 and that its variation is 0.003ft/s^2/ 1000ft ascent. find the height in miles above its point for which g = 30.504 ft/s^2 and what is the weight of a 180lb man on top o..
What percentage of error in would be made if the moment of inertia of the pulley were avoid? Ignore friction in the pulley bearings.
Object 1 has a mass m1 and a velocity 1 = (2.87 m/s). Object 2 has a mass m2 and a velocity 2 = (3.01 m/s). The total momentum of these two objects has a magnitude of 18.0 kg • m/s and points in a direction 66.5° above the positive x-axis. Find out m..
A 23 g ball is fired horizontally with initial speed toward a 110 g ball that is hanging motionless from a 1.1m long string. The balls undergo a head on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle theta m..
An electron is shot upward directly perpendicular to the lower plate of a parallel plate capacitor. Its initial velocity is 3.0 x 104 m/s. What must be the potential of the upper plate if the electron stops just before reaching it? The lower plate..
If the balls are released from a height where the bottom of the basketball is at 0.781m above the ground, what is the absolute value of basketball's momentum just before it hits the ground.
A student shoots spitball at the wall from a height of 1.50 meters. The spitball has an initial horizontal velocity of Vxo, other than has no vertical velocity component. The spitball lands on the ground 8 meters from where it was shot. What is the V..
With the battery disconnected the compass needle points to the right, in the plane of the coil. The apparatus is located near equator, where the Earth's magnetic field B Earth is horizontal, with a magnitude of 4×10-5 tesla. (Presume that B Earth ..
Two freight cars, each with a mass of 2.9 x 10^5 kg, collide and stick together. One was initially moving at 2.80 m/s and the other was at rest. What is the final speed.
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