Master Physics with Fun Quizzes & Brain Teasers!

it takes harry 36 s to walk from x1 = -10 m to x2 = -48 m . part a what is his velocity?
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when a spherical galaxy with stellar density n(r ) is viewed from a great distance along the axis z, show that the surface density at distance r from the center is
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How to solve Conversation
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at what relative humidity do you expect a maximum in the corrosion rate? please explain your answer.
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what is the specific activity (in ci/g) if 1.3 g of an isotope emits 4.13 108 particles per hour? enter your answer in scientific notation. 10 ci/g
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What is the energy released in this alpha decay reaction 83212Bi 81208Tl + 24He? (The atomic mass of 212Bi is 211.9912857 u and that of 208Tl is 207.9820187 u) Answer in Mev.
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what is the lowest possible energy (in electron volts) of an electron in hydrogen if its orbital angular momentum is 2 ?
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work A cart with a mass of 5.00 kg rolls down a hill that 1.25 m high. Assuming that the cart started from rest and ignoring friction and the rolling inertia of the wheels, answer the following: a) What is the cart's linear velocity at the bottom of the hill? b) What is the cart's final linear kinetic energy? c) What is the cart's linear momentum at the bottom of the hill? d) If the wheels on the cart have a radius of 0.10 m, what is the angular velocity of a wheel at the bottom of the hill? e) What was the car's Gravitational Potential Energy when it is halfway down the hill?
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Using the formula for the wave function given in Equation (9), ym (x,t) = Am cos(2fmt)cos(mx / L) show that the wavefunction for a machine that is unclamped at both ends has antinodes at both ends.
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A ray of white light strikes the surface of a 4.0-cm-thick slab of flint glass as shown in the figure. As the ray enters the glass, it is dispersed into its constituent colors. Estimate how far apart (in mm) the rays of deepest red and deepest violet light are as they exit the bottom surface.
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Problem 4: A steam engine operates between 1200C and 430C. The engine requires a power input of 110 kW meaning it absorbs 110 kJ of energy via heat per second. * 50% Part (a) What is the maximum theoretical efficiency of this engine?
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A loudspeaker of mass 25.0 kg is suspended a distance of = 2.20m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of = 3.90 .m What is the tension in each of the cables?
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question 8: diode, 2 in parallel, opposing, find i , and . treat both diodes with the offset-ideal model having a of volts. which of the two diodes is on? d1 d2 what is the current in the on diode?
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A 44-kg ice skater moves across the ice at a constant speed of 2.0 m/s. She is caught by her 76-kg partner, and then the pair continues to glide together. He is at rest when he catches her, and immediately afterward they both coast. Even though the "magnitude of the change in momentum" is requested, you should provide a negative sign if the final momentum is less than (or more negative) than the initial momentum.Part A: What is their velocity just after the catch? Assume she moves in the positive x-direction before her partner catches her.Part B: A skater follows the girl at a constant speed of 1.0 m/s. What is the magnitude of the girl's change in momentum in the reference frame of the skater?Please answer with units
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Two identical cars approach each other head-on while traveling at the same speed v.A. What does an observer in the Earth reference frame measure for the speed of the zero-momentum reference frame of this two-car system? Express your answer in terms of v.B. Suppose the same cars are traveling in the same direction at the same speed v. Now what does an observer in the Earth reference frame measure for the speed of the zero-momentum reference frame? Express your answer in terms of v.
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You push your 0.70-kg pillow across your bed with a constant force of 19 N . The bed provides a frictional force of 9.0 N .What is the acceleration of the center of mass of the pillow? Assume that the direction of your push is the positive direction.
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Suppose you want to produce a double-slit interference pattern where the distance between successive bright fringes on the screen is at least 1.25 cm. If the slits have a width of 0.0400 mm and a separation of 0.250 mm, what is the minimum distance needed from the slits to the screen when a He-Ne laser ( = 633 nm) is used?
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what is a normal line?
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1.0 l of liquid water is introduced into the flask containing both gases. the pressure is then measured about 45 minutes later. would you expect the measured pressure to be higher or lower?
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"Travel to the stars requires hundreds or thousands of years, even at the speed of light. Some people have suggested that we can get around this difficulty by accelerating the rocket (and its astronauts) to very high speeds so that they will age less due to time dilation. The fly in this ointment is that it takes a great deal of energy to do this. Suppose you want to go to the immense red giant Betelgeuse, which is about 500 light-years away. You plan to travel at constant speed in a 1000 kgkg rocket ship (a little over a ton), which, in reality, is far too small for this purpose.If the rocket ship's speed is 0.500 c, calculate the time for the trip, as measured by people on earth.
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ball is released from rest at the top of a hill and rolls without slipping with constant center-of-mass acceleration. How long will it take to make its second revolution if it took 3.27 s to make its firstrevolution? Note: Information not given (including the ball's mass and radius is not needed to colve theproblem.]
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A heat engine absorbs 347 J of thermal energy and performs 33.5 J of work in each cycle.Find the efficiency of the engine.Find the thermal energy expelled in each cycle.Answer in units of J
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what is the frequency of electromagnetic radiation with a wavelength of 445 nm appears as blue light to the human eye?
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based on kogut, 2-7. at 1:00 a spaceship passes earth with a velocity of 0.8 c. observers on the ship and on the earth synchronize their clocks at that moment.a. At 2:30, as recorded in the spaceship's frame, the ship passes another space probe that is fixed relative to the Earth and whose clocks are synchronized with respect to the Earth. What time is it according to the space probe's clock?b. How far from the Earth is the probe, as measured in the Earth's frame?c. At 2:30, spaceship time, the ship sends a light signal back to Earth. According to Earthbound clocks, when is the signal received on Earth?d. Earth immediately sends another light signal back to the spaceship. According to spaceship time, when does the spaceship receive this reply signal?
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