Master Physics with Fun Quizzes & Brain Teasers!

Write an expression for the speed of the heavier mass as a function of their separation distance, r, which is measured cm to cm and decreases over time as the masses move toward each other due to their gravitational attraction.
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At t = 0 what are the two smallest positive values of x for which the probability function |(x,t)|2 is a maximum?
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PLEASE HELP DUE IN 5 MINUTES The acceleration due to gravity g at a distance r from the center of a planet of mass Mis 9 m/s2. In terms of the orbital distance r, whatwould the speed of this satellite have to be to remain in a circular orbit around this planet at this distance?Ov=3/5v=3rv=6rv=9r
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Why are relativistic calculations particularly important for electrons
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Dylan has a weight of 620 n when he is standing on the surface of the earth. what would his weight (the gravitational force due to the earth) be if he tripled his distance from the center of the earth by flying in a spacecraft?
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Based on the text how might the surfing "purists" feel about the movement toward incorporating aerial moves into surfing competitions? Use evidence from the text to support your answer
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A man pulled a food cart 4. 5 m to the right for 15 seconds. What is the average speed of the food cart to the nearest tenth of a m/s
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A 30 kg block with velocity 50 m/s is encountering a constant 8 N friction force. What is the momentum of the block after 15 seconds?
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A) When a submarine dives to a depth of 500 m, how much pressure, (in Pa) must it's hull be able to withstand? b) How many times greater is this pressure than the pressure at the surface. Recall pressure at the surface is atmospheric pressure at sea level which equals 14. 7 psi (101 kPa). Hint when determining how many times greater remember How many times greater factor = BIGGER/ smaller)
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The team coach is watching the bowler. She notes in Table 1 howfar the ball travels, and the time taken to reach the batsman. Table 1Ball12345Time in s0. 420. 460. 480. 550. 58Distance in m17. 5518. 3018. 4017. 9017. 75Suggest a pattern, if any, between the time the ball is in flight andthe distance the ball travels. What is the resolution of the stopwatch the team coach uses totime the ball?
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The Really Big Dam is 1000 feet wide, holds back a depth of 60 feet of water, and the lake behind the dam extends back one quarter of a mile. The Very Big Dam is also 1000 feet wide, holds back a depth of 50 feet of water, and the lake behind the dam extends back for 2 miles. If the dams were constructed in the same way, which dam had to be constructed to be strongest? (Assume the water levels do not vary seasonally. )
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A glass slides across a bar and slows down due to a kinetic friction of 0.175n. if the glass weighs 0.500n, what is the coefficient of kinetic friction between the glass and the bar?
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A lot of points describe, in terms of subatomic particles, what occurs when a person experiences a static "shock"
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A water droplet falling in the atmosphere is spherical. assume that as the droplet passes through a cloud, it acquires mass at a rate proportional to ka where k is a constant (k>0) and a is its cross-sectional area. consider a droplet of initial radius r0 that enters a cloud with a velocity v0. assume no resistive force and show: a. that the radius increases linearly with the timeb. that if r0 is negligibly small then the speed increases linearly with the time within the cloud.
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A pendulum is constructed from a thin, rigid, and uniform rod with a small sphere attached to the end opposite the pivot. This arrangement is a good approximation to a simple pendulum (period = 0. 65 s), because the mass of the sphere (lead) is much greater than the mass of the rod (aluminum). When the sphere is removed, the pendulum no longer is a simple pendulum, but is then a physical pendulum. What is the period of the physical pendulum?
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A boat's propeller has a rotational inertia of 4. 0 kg m. After a constant torque is applied for 12 s, theradradpropeller's angular speed changes from a clockwise 6. 0 to a counterclockwise 6. 0SSWhat was the torque applied to the propeller?
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Your quadcopter has a terrible altitude sensor. To see how bad it really is you take many measurements with the quadcopter at 1 meter altitude. Your altitude sensor gives a mean of 1. 00 meters with a standard deviation of 13cm. The measurements are normally (Gaussian) distributed. What is the probability that your altimeter gives an error of less than 10cm for a single measurement?
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A hoop (i=mr^2) of radius 0.50 m and a mass of 0.20 kg is released from rest and allowed to o go roll down an inclined plane. how fast is it moving after dropping a vertical distance of 3.0 m?a. 7.7 m/sc. 5.4 m/sb. 6.2 m/sd 3.8 m/s
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What would be the linear velocity of a boy's toes doing a cartwheel who is 2.1 m long from the tip of his toes to the end of his fingers and who is experiencing a centripetal force of 5.0 m/s2?
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Two identical test dummies are each dropped from a height of 3. 00 m. The first is dropped onto the concrete, and the skull fractures. The 2nd is dropped in the same manner also onto concrete but is also wearing a bicycle helmet and the skull does not fracture. Use the terms force, impulse, and time to explain why the two identical test dummies dropped in the same manner had very different outcomes
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Four students are each given an identical resistor and asked to find its resistance. They each measure the potential difference across the resistor and the current in it. One student makes a mistake. Which row shows the results of the student that makes a mistake
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Toad and Toadette just had their first little toadstool! Toad's family is known to be purebred dominant for red spots on their white cap. Everyone was shocked when Little Toad was born with a white cap with white spots instead of red. Toadette is very upset as she thinks the Mushroom Kingdom Hospital accidentally switched babies. Is this true? Did the hospital really switch babies? Choose either "yes" or "no" and defend your answer.
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ii. how long it takes to travel 294 m below the point of projection.
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A length of copper wire was measured with a tape measure to give a length of 50. 0m with an uncertainty of 1 cm. The thickness of the wire was measured to be 1. 00mm,using a micrometer screw gauge. Calculate the volume of the copper used?
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