11/18/16

Work And Energy 6
How much work does a supermarket checkout attendant do on a can of soup he pushes 0.510 m horizontally with a force of 5.30 N? Express your answer in joules and kilocalories.   J   kcal
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11/17/16

Work And Energy 10
(a)How long (in s) would it take a 1.50 ✕ 105 kg airplane with engines that produce of 100 MW of power to reach a speed of 300 m/s and an altitude of 12.0 km if air resistance were negligible? ... more
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11/16/16

physics harry potter.
Neville Longbottom was dared by his friends to go down Suicide Hill, but at point P he gets a little nervous. From point P to Q he drags a foot and creates some friction, so μk=0.14. Suppose the... more
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11/16/16

Flowers and physics. speed.
A 4.5 kg flower pot sits precariously on a windowsill h1=31.9 meters above the ground. Your apartment is h2=14.6 meters above the ground, directly under the flower pot. If the flower pot falls past... more
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11/15/16

Physics Dynamics review
A steel spring is stretched from length 3.0 cm to a length of 8.0 cm. If the spring constant is 200 N/m, what force is required? Make sure you draw a FBD and write Fnet = ma to begin this solution.
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11/15/16

question is from physics
Q A ball of the mass m is moving with velocity v. It strikes the floor and rebounce with the same velocity. If... more
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11/13/16

kinetics question (physics) please help :)
Neville Longbottom was dared by his friends to go down Suicide Hill, but at point P he gets a little nervous. From point P to Q he drags a foot and creates some friction, so μk=0.13. Suppose the... more
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11/13/16

physics kinetics question pt 2, please help :)
A shopper exerts a 165 Newton force straight upward to lift a bag of groceries that has a mass of 9.5 kg. Starting from rest, the groceries are lifted from the ground to a height of 1.38 meters.... more
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11/09/16

Physics - Moment of Inertia
Consider an equilateral triangle cut from a thin board. The triangle has a mass M and an edge length L. Determine the moment of inertia of the triangle for rotation about an axis that bisects one... more
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11/07/16

momemt of inertia
We have to find moment of inertia of a semi circular disc whose axis of rotation is passing through the centre making an angle k with the diameter and lying in the plane of disc .
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11/04/16

Rotational Motion 3
The tires on a new compact car have a diameter of 2.0 ft and are warranted for 60,000 miles.(a) Determine the angle (in radians) through which one of these tires will rotate during the warranty... more
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11/04/16

Rotational Motion
A 55.7 kg ice skater is moving at 3.92 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.798 m around the pole.(a)... more
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11/03/16

what is the answer to a resultant force with a magnitude of 20. newtons can be produced by two concurrent forces having a magnitude of what
what is the answer to a resultant force with a magnitude of 20. newtons can be produced by two concurrent forces having a magnitude of what
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11/03/16

Rotational Emotion
A tire 2.0 ft in diameter is placed on a balancing machine where it is spun so that its tread is moving at a constant speed of 54 mph. A small stone is stuck in the tread of the tire. What is the... more
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11/03/16

How do I get part C? Physics help
2) Stairs are about 18 cm in height for each step.a) If a person of mass 65 kg goes up the steps at a rate of 2 steps per second, what is the change in the person’s gravitational potential energy... more
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11/02/16

Physics homework questions
1) Suppose that when you move a magnet through a 26.3-turn coil at a certain speed, a voltage of 51.0 Volt is induced across the coil. If you move the same magnet through a 445.5-turn coil at the... more
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11/01/16

Weston and Kaden are standing on a spinning merry-go-round. Weston throws ball directly at Kaden. The ball....
a). Gets to Kaden b). From Weston's standpoint goes to the right of Kaden c). From Kaden's standpoint goes to the left of Weston. Explain?
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11/01/16

Newton's Law of Cooling (Time of death)
A detective was asked to estimate the time of death of a man. At 8:20 p.m., it's body temperature was at 27 degrees celsius. The detective found out that the air condition in the room was set to 23... more
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10/28/16

Center of Mass and Moment of Inertia of Extended Objects
Consider a uniform rod with length L and mass M placed on the x-axis between the points (-1/3*L, 0) and (2/3*L, 0). Determine the moment of inertia of the rod for rotation about the y-axis by... more
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10/28/16

Equilibrium of forces
 A uniform meter rule of mass 90g is pivoted at the 40cm mark.if the rule is in equilibrium with an unknown mass M placed at a the 10cm mark and a 72g mass at the 70cm mark,determine M
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10/28/16

Equilibrium of forces
A uniform meter rule AB is balanced on a knife edge which is 55cm from B. If a mass of 10g is hung at P,which is 10cm from A. Calculate the mass of the rule
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10/27/16

Two masses connected by a system of pulleys: Talking about acceleration
Block A, of mass mA, sits atop of a smooth (frictionless) surface as it is pulled by block B, of mass mB, to which it is connected via a set of light ropes and perfect pulleys. (a) Determine the... more
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10/27/16

Chain Friction Partition Problem
A chain with a uniform linear mass density (mass per unit length) is placed on a surface with a static coefficient of friction µ. What is the maximum fraction of the chain's total length that can... more
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10/21/16

What is the average value of the coefficient of kinetic friction between puck and ice?
A hockey puck is hit on a frozen lake and starts moving with a speed of 12.0 m/s. Five seconds later it's speed is 6.00 m/s. What is the average value of the coefficient of kinetic friction between... more
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10/21/16

Find the coefficients of static and kinetic friction between crate and floor
 A dlock worker loading crates on a ship finds that a 20 kg crate, initially at rest on a horizontal surface requires a 75-N horizontal force to set it in motion. However, after the crate is in... more
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