@gravityPhy

Spread the joy of physics. Competitions, Problems, Facts about physics. See @mathisstillfun for our mathematics account.

 Canada
Joined August 2022
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2019 Canadian CAP High School/CEGEP Prize Exam Problem 8
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7,591
2009 Oxford PAT
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8,672
A planet in a distant solar system is 10 times more massive than the earth and its radius is 10 times smaller. Given that the escape velocity from the earth is 11km/s, the escape velocity from the surface ofthe planet would be?
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8
4,046
🤓
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8,645
You want to make a snowman out of modelling clay. The snowman consists of two spheres, one sphere has a radius r, and the other has a radius 2r. The modelling clay comes in the form of a cylinder with radius r/2. What length of modelling clay is required to make the snowman?
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3,830
Easy 😊
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Easy 😊
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A cylinder has a radius R and weight G. You try to roll it over a step of height h < R. The minimum force needed to roll the cylinder over is: From F = ma Exam A: January 23, 2019
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2021 JEE Advanced problem
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A 2.0 kg block at rest on an inclined plane of inclination 37∘ is pulled up the plane by applying a constant force of 20 N parallel to the incline. The force acts for one second. Find the work done by gravity in that one second if the work done by the applied force is 40 J.
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Two blocks of masses 10 kg and 4 kg are con­nected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14 m/s to the heavier block in the direction of the lighter block. What is the velocity of the center of mass?
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A 90-g ball moving at 100 cm/s collides head-on with a stationary 10-g ball. Determine the speed of each after impact if (a) they stick together, (b) the collision is perfectly elastic 1/2
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a. (a) 90 cm/s, (b) 80 cm/s; 1.8 m/s b. (a) 100 cm/s, (b) 80 cm/s; 20 cm/s c. (a) 900 cm/s, (b) 90 cm/s; 90 cm/s d. (a) 50 cm/s, (b) 1110 cm/s; 180 cm/s 2/2
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from 1994 CAP High School Prize Exams
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A scale is calibrated so that it gives a correct reading when sitting on the ground. A person holds the scale and presses it on both sides with their hands, pushing up on the bottom with the left hand and pushing down on the top with the right. (1/2)
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The scale has a mass of 5 kg, and their left hand exerts a force of 200 N. What is the reading of the scale? (2/2)
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A flexible scatter rug, of mass M and length L, is tightly coiled into a cylinder of radius R (≪ L). If the coiled rug is released, in the absence of rolling friction, it spontaneously unrolls to full length. How large is a horizontal F to prevent the unrolling of the rug?
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You got it. One related link holooly.com/solutions/one-en… Thanks for the discussion
Gravity@gravityPhy24 Sep 2022
Is this solvable? 😀 One end of a rope is fixed to a vertical wall and the other end is pulled by a horizontal force of 20 N. The shape of the flexible rope is shown in the figure. Find its mass.
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Is this solvable? 😀 One end of a rope is fixed to a vertical wall and the other end is pulled by a horizontal force of 20 N. The shape of the flexible rope is shown in the figure. Find its mass.
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A rubber eraser is placed at one edge of a quarter-circle-shaped track of radius R. It is then released. The coefficient of friction between the eraser and the surface of the track is μ = 0.6. Will the eraser move at all?
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