Master Physics with Fun Quizzes & Brain Teasers!

An empty bottle has a mass of 35.00 grams. When filled with water, it has a mass of 98.44 grams. Of the same bottle is filled with a different fluid, the mass is 89.22 grams. What is the specific gravity of this other fluid
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A 50-loop circular coil has a radius of 3 cm. It is oriented so that the field lines of a magnetic field are perpendicular to the coil. Suppose that the magnetic field is varied so that B increases from 0.10 T to 0.35 T in 2 ms. Find the induced emf in the coil.
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The spring of a spring gun has force constant k = 400 N/m and negligible mass. The spring is compressed 6.00 cm and a ball with mass 0.0300 kg is placed in the horizontal barrel against the compressed spring. The spring is then released, and the ball is propelled out the barrel of the gun. The barrel is 6.00 cm long, so the ball leaves the barrel at the same point that it loses contact with the spring. The gun is held so the barrel is horizontal.(a) Calculate the speed with which the ball leaves the barrel if you can ignore friction. (b) Calculate the speed of the ball as it leaves the barrel if a constant resisting force of 6.00 N acts on the ball as it moves along the barrel. (c) For the situation in part (b), at what position along the barrel does the ball have the greatest speed, and what is that speed? (In this case, the maximum speed does not occur at the end of the barrel.)
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Liz has designed a sailboat. She wants to build a prototype of the boat. Liz has $12,000 to spend on the boat. $7,000 of that money is budgeted for wood. Liz needs 500 ft of wood planks. Assuming that Liz will use only one type of wood for her entire project, which of the following could she use to stay on budget?A. Marine plywood only.B. She could use any of these woods listed.C. Marine plywood of Douglas for only.D. Marine plywood, Douglas fir, or white oak only
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A cave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. The lift is performed in three stages, each requiring a vertical distance of 15.0 m: (a) the initially stationary spelunker is accelerated to a speed of 2.40 m/s; (b) he is then lifted at the constant speed of 2.40 m/s; (c) finally he is decelerated to zero speed. How much work is done on the 85.0 kg rescue by the force lifting him during each stage
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A projectile is launched in the horizontal direction. It travels 2.050 m horizontally while it falls 0.450 m vertically, and it then strikes the floor. How long is the projectile in the air
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Find the moment of inertia about each of the following axes for a rod that is 0.360 {cm} in diameter and 1.70 {m} long, with a mass of 5.0010-2 {kg}.1. About an axis perpendicular to the rod and passing through its center. (in I=kg*m^2)2. About an axis perpendicular to the rod and passing through one end.3. About an axis along the length of the rod.
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Which best describes the motion of the object between 1 and 4 seconds?
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Tether ball is a game children play in which a ball hangs from a rope attached to the top of a tall pole. The children hit the ball, causing it to swing around the pole. What is the total initial acceleration of a tether ball on a 2.0 m rope whose angular velocity changes from 13 rad/s to 7.0 rad/s in 15 s
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A 1.15-kg mass oscillates according to the equation where x is in meters and in seconds. Determine (a) the amplitude, (b) the frequency, (c) the total energy, and (d) the kinetic energy and potential energy when
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Two parallel, metal plates with separation distance d = 1.00 cm carry charges of equal magnitude but opposite sign. The plates are oriented horizontally. Assume the electric field between the plates is uniform, and it has a magnitude of 1,920 N/C. A charged particle with mass 2.00 10^16 kg and charge 1.02 10%6 C is projected from the center of the bottom negative plate with an initial speed of 1.07 10%5 m/s at an angle of 37.0 above the horizontal. Assume the plates are square with side length = 20.0 cm.Required:a. Describe the trajectory of the particle.b. Which plate does it strike?c. Where does it strike, relative to its starting point?d. What is the minimum initial speed (in m/s) the particle must have in order to change the answer to part (b)?
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40 g of magnesium and 40 g of oxygen react in a chemical reaction in a close system which of the following must result
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Objects falling through air experience a type Of friction called ____
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A hollow spherical iron shell floats almost completely submerged in water. The outer diameter is 60.0 cm, and the density of iron is 7.87 gc m cubed . Find the inner diameter in cm. Express to 3 sig figs.
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A force acts on a 9.90 kg mobile object that moves from an initial position of to a final position of in 5.40 s. Find (a) the work done on the object by the force in the 5.40 s interval, (b) the average power due to the force during that interval, and (c) the angle between vectors and .
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A diver running dives out horizontally from the edge of a vertical cliff and 3.0 s later reaches the water below. How high was the cliff and how far from its base did the diver hit the water?
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Consider a single slit that produces a first-order minimum at 16.5 when illuminated with monochromatic light. show answer No Attempt 50% Part (a) At what angle, in degrees, is the second-order minimum?
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A 1.0-kg ball on the end of a string is whirled at a constant speed of 2.0 m/s in a horizontal circle of radius 1.5 m. What is the work done by the centripetal force during one revolution
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A student decides to spend spring break by driving 50 miles due east, then 50 miles 30 degrees south of east, then 50 miles 30 degrees south of that direction, and to continue to drive 50 miles deviating by 30 degrees each time until he returns to his original position. How far will he drive, and how many vectors must he sum to calculate his displacement?a. 600 ml, 12 b. 0, 0 c. 400 ml. 8 d.0,12 e. 0,8
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A charged particle moves from point A to point B in an external electric field, and in the process its kinetic energy decreases fro, 87.6 J at A to 57.3 J at B. The electric potential at A is -48.0 V, and the electric potential at B is 18.0 V. What is the charge of the particle, including sign
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Which of the following is not true about centripetal force? Check all thatapply.A. It's the same as centrifugal force.B. It's also called an inward force.C. Centripetal force keeps a car on the road going around a curve.D. Without centripetal force, an object would continue in a straightline.E. Centripetal force is the same as gravity.multiple answer question
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An 18-kg bicycle carrying a 62-kg girl is traveling at a speed of 7 m/s. What is the kinetic energy of the girland bicycle combined together?
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A force of 2500 N is exerted on a piston that has an area of 0.060 m2. Whatforce is exerted on a second piston that has an area of 0.18 m?F F21, 2,
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Arden is making a pros and cons list about genetic engineering for a debate at school. Which part of her list is incorrect? Pros Cons Pro 1: Can be used to make medicine Con 1: Genetically modified organisms can affect the environment around them Pro 2: Can create organisms that survive in different environments Con 2: The edited gene is more likely to mutate and cause disease Pro 1 Pro 2 Con 1 Con 2
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