Master Physics with Fun Quizzes & Brain Teasers!

Draw the path of the light ray until it reaches point X. Show how the change in the speed of the light ray affects its direction as it passes from one medium to another. Remember, light travels more slowly in glass than it does in air. Hint: The light will bend both when it enters and when it exits the glass!
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A 100-coil spring has a spring constant of 470 n/m. it is cut into four shorter springs, each of which has 25 coils. one end of a 25-coil spring is attached to a wall. an object of mass 35 kg is attached to the other end of the spring, and the system is set into horizontal oscillation. what is the angular frequency of the motion?
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The lowest note on a piano is27. 5 Hz. To fit inside the piano,the string for the low note can't belonger than 1. 20 m. If it takes thefull length, what is the speed ofthe wave in the string?(Unit = m/s)
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A toaster is listed as 1560 w. when it is plugged into a 120 v circuit and starts to make toast, how many amperes will it draw
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The resistance in a series rcl circuit is doubled. (a) does the resonant frequency increase, decrease, or remain the same
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Using a cable with a tension of 1350 n, a tow truck pulls a car 5.00 km along a horizontal roadway. (a) how much work does the cable do on the car if it pulls horizontally
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Find the mass of a circular moving object that has a centripetal force of 1345 N and an acceleration of 36. 2 m/s2? Ruichao is spinning her backpack around and around. If her backpack has a mass of 8 kg, what centripetal acceleration would it have if she applies a centripetal force of 120 N? Callum is playing tetherball. The tetherball has a mass of 0. 4 kg and has a tangential velocity of 2. 4 m/s. If the tetherball rope is 1. 5 m long, what centripetal force does Callums tetherball have? Melissa and Cody are on a fun fair ride that spins them in a circle with radius 6 meters. If Melissa has a mass of 55 kg and Cody has a mass of 65 kg, what centripetal force will they have together if they have an acceleration of 2. 2 m/s2? Bethany is swinging her grocery bag as she walks. The radius of her swing is 0. 8 m. If she can provide a tangential velocity of 2. 7 m/s and a centripetal force of 68 N, what centripetal accel-eration will her groceries have?
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Measuring the length from the lowest point of a spring-mass to the highest point, it is found to be 42 cm. What is the amplitude?a. 42cmb. 0. 42mc. 84cm d. 21cm
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Sammy Hagar is doing a concert on a stage that travels down the highway at 32 m/s. During warm-up the band realizes that their concert F needs to be adjusted to sound right to the audience whichis standing still. If a concert Fis 540 Hz, what frequency should they play to make it sound right
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Make a problem where an object goes through three different energy changes. The last change needs to be a situation where all the energy turns into Spring Potential energy. Write the problem, then separately solve it
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25. 0 kg dog is trapped on a rock in the middle of a narrow river. A 66. 0-kg rescuer has assembled a swing with negligible mass that she will use to swing down and catch the trapped dog at the bottom of her swing, and then continue swinging to the other side of the river. The ledge that the rescuer swings from is 5. 0 m above the rock, which is not high enough so the rescuer and dog together can reach the other side of the river, which is 3. 0 m above the rock. However, the rescuer can use a ladder to increase the height from which she swings. What is the minimum height of the ladder the rescuer must use so both dog and rescuer make it to the other side of the river? Assume that friction and air resistance are negligible
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A 5.0 gram piano wire spans 44.0 cm. to what tension must this wire be stretched to ensure that its fundamental mode vibrates at the d4 note (f
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Particles 91, 92, and q3 are in a straight line. Particles q1 = -1. 60 x 10-19 C, q2 = +1. 60 x 10-19 C,and q3 = -1. 60 x 10-19 C. Particles q1 and q2 areseparated by 0. 001 m. Particles q2 and q3 areseparated by 0. 001 m. What is the net force on q2?Remember: Negative forces (-F) will point LeftPositive forces (+F) will point Right-1. 60 x 10-19 C+1. 60 x 10-19 C-1. 60 x 10-19 C91+ 92930. 001 m0. 001 m
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(1]2] Which row links both the photoelectric effect and electron diffraction to the properties ofwaves and particles?[1 mark]Photoelectric effect | Electron diffractiona Particle property Particle property8 | Wave property Wave propertyParticle property Wave property| Wave property Particle property
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The andromeda galaxy, m31, is in many ways similar to our own galaxy but slightly larger. the linear diameter of the andromeda galaxy along its longest axis is 140,000 light-years, but from our perspective, the andromeda galaxy has a maximum angular diameter of 3.18. how far away is the andromeda galaxy?
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An electric kitchen range has a total wall area of 1. 40 m2 and is insulted with a layerof fiber glass that has a temperature of 175oC and its outside surface is 35 oC. Thefiber glass has a thermal conductivity of 0. 040 Wm-1K-1. Calculate the rate of flow ofheat through the insulation, assuming the fibre as a flat slab of area of 1. 40 m2
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10. A thin beam of laser light of wavelength 514 nm passes through a diffraction grating having 3952 lines/cm. The resulting pattern is viewed on a distant curved screen that can show all bright fringes up to and including 90. 0 from the central spot. What is the TOTAL number of bright fringes that will show up on the screen? A) 4 B) 5 C) 8 D) 9 E) 10
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1. A car runs into a fence, and the fence dents the car. 2. Karen drops a marble on the ground, and it rolls across the floor in a straight line. 3. Matthew lets go of a recently blown up balloon, and it flies across the room as the air escapes. 4. Pushing your baby brother on the swing makes him go higher. 5. You place a pencil on your desk, and it stays there. Which laws of motion are each one?
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What is the approximate electrostatic force between two protons each having a charge of +1. 6 x 10-19 C separated by a distance of 1. 0 106 meter?A)2. 3 1016 N and repulsiveB)2. 3 1016 N and attractiveC)9. 0 1021 N and repulsiveD)9. 0 1021 N and attractive
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(g) two masses mand m2(m > m2) slide down a rough inclined surface of the samelength and inclination. which of the masses would be the first to get to the bottom? givereasons for your answer.
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A computer simulation attached to controls that include a steering wheel,brakes, and gas pedal can be used to help people who are learning to drive. The controls sense the forces applied, and the computer simulation showshow a car would respond. What is one benefit of this model?A. It can show how to the driver will react when passengers are in thecar. B. It can be used to teach drivers how to operate other types ofvehicles, such as boats. OC. It can show what happens when the driver turns a corner. D. It does not show traffic signs for drivers.
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Help please!!How many atoms of C would you have if there were 1.23 moles of C? Show your work for this.
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Help please!How many moles of C would you have if you had 7.77 x 1024 atoms of C? Show your work.
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What is the speed of the wave of its frequency is 8.0 hertz?
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