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The 2 kg block slides down a frictionless curved ramp, starting from rest at a height of h = 4 m. The block then slides d = 13 m on a rough horizontal surface before coming to rest. (a) What is the speed of the block at the bottom of the ramp? (b) What is the energy dissipated by friction? (c) What is the coefficient of friction between the block... show more
4 hours ago
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• Are x-ray and gamma ray two kinds of electromagnetic radiation which is radioactive?

4 hours ago
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• Can anyone help me with my scalar product problem?

If the vectors A and B have magnitudes of 10 and 11, respectively, and the scalar product of these two vectors is -100, what is the magnitude of the sum of these two vectors?
4 hours ago
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• Can anyone help me with my physics problem?

A 2.0-kg block situated on a frictionless incline is connected to a light spring (k = 100 N/m), as shown. The block is released from rest when the spring is unstretched. The pulley is frictionless and has negligible mass. What is the speed of the block when it has moved 0.20 m down the plane?
4 hours ago
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• Physics help..?

The Royal Gorge bridge over the Arkansas River is 310 m above the river. A 62-kg bungee jumper has an elastic cord with an unstressed length of 62 m attached to her feet. Assume that, like an ideal spring, the cord is massless and provides a linear restoring force when stretched. The jumper leaps, and at at her lowest point she barely touches the... show more
5 hours ago
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• A Missile was projected vertically in the air with a speed of 80 m/s and comes to rest. How long and how far would it travel before doing so?

5 hours ago
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• What is the magnitude of the force of the post nearest to the painter?

An 82-kg painter stands on a long horizontal board 1.55 m from one end. This 27-kg board is uniform, 5.5 m long, and supported at each end by vertical posts. A: What is the magnitude of the total force provided by both posts? B: What is the magnitude of the force of the post nearest to the painter? I know to do Part A but I am stuck on Part B.... show more
7 hours ago
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• I need help with this question below.?

Calculate the time it takes a cannon to fall to the ground, if it is initially fired horizontally at a velocity of 69.3m/s at a height of 46.9m. Round to the nearest tenth.
8 hours ago
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• I need help with this question below.?

A projectile fired horizontally will have Question 4 options: an initial vertical velocity of 9.81 m/s. an initial horizontal velocity of 9.81 m/s. an initial horizontal velocity of 0 m/s. an initial vertical velocity of 0 m/s.
8 hours ago
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• Introductory Physics Question. Help Greatly appreciated!?

A certain place connecting two mountains together has an initially-horizontal wire connecting one mountain to the other, 300 m apart. A person can ride across the gap by stepping into a lift chair after kicking off from one mountain’s edge to get to the other side. Suppose the person has a mass of 65 kg and the chair has a mass of 25 kg. After... show more
8 hours ago
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An airplane travels at an air speed of 68.4m/s 30.0 degrees north of east. The wind is blowing 15.2m/s 60.0 degrees west of north. What is the magnituge of the airplanes velocity relative to the ground? Round to the nearest tenth.
8 hours ago
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A car is travelling at a speed of 20.9 km/h to the east. A truck is travelling a way from the car, at a speed of 32.9 km/h west. What is the velocity (km/h) of the truck relative to the car? (answer with east being positive and west being negative)
8 hours ago
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Given an ant travels 15.1cm north, then 11.7cm west and finally 4.7cm south, what is the magnitude of the ants velocity if it takes him 36.6 seconds total? Round to the nearest tenth of a cm/s.
8 hours ago
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• Physics question?

A 0.80 kg stone attached to a string is whirled in a horizontal circle of radius 49 cm as in the conical pendulum of Example 5-9. The string makes an angle of 30° with the vertical. Find the speed of the stone. Find the tension in the string.
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• Physics question?

Question Part Points 1 2 3 0/1 0/1 1/1 Total 1/3 More Mysterious Sliding Stones Along the remote Racetrack Playa in Death valley, California, stones sometimes gouge out prominent trails in the desert floor, as if they had been migrating. For years curiosity mounted about why the stones moved. One explanation was that strong winds during the... show more
8 hours ago
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• Physics Problem?

A scallop forces open its shell with an elastic material called abductin, whose Young modulus is 2.12× 10^5 N/m. This piece of abductin is 3.55 mm thick and has a cross-sectional area of 0.604 cm^2. The abductin is compressed 1.34 mm. We will assume the shell is effectively composed of two plates each with a moment of inertia of 1/3𝑚𝐿^2 , where the... show more
8 hours ago
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• How many revolutions does the wheel turn before coming to rest?

An electric motor rotating a workshop grinding wheel at a rate of 229 rev/min is switched off. Assume constant angular deceleration of magnitude 1.69 rad/s^2. Through how many revolutions does the wheel turn before it finally comes to rest? Answer in units of rev. Thank you!
8 hours ago
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• A ball is thrown 97.5 m up and then falls back to earth how long will it be in the air total accelof gravity is 9.8 m/s2 no air resistance?

9 hours ago
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