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Cristopher Guevara

Cristopher G.

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INSTANT ANSWER

An object is moving in simple harmonic motion. If you quadruple the spring constant k, the acceleration of the object shall

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center of mass

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INSTANT ANSWER

A 1000-kg whale swims horizontally to the right at a speed of 6.0 m/s. It suddenly collides directly with a stationary seal of mass 200 kg. The seal grabs onto the whale and holds fast. What is the momentum of these two sea creatures just after their collision? You can neglect any drag effects of the water during the collision.

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Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s relative to the ice. What speed does the 60-kg skater acquire relative to the ice?

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INSTANT ANSWER

An atom (mass = 30.40 u) moving at 515 m/s to the right collides with a molecule (mass = 32.57 u) moving in the same direction at 326 m/s. After the collision, the molecule moves at 7 m/s to the right. What is the velocity (in m/s) of the atom after the collision?

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On a highly polished, essentially frictionless lunch counter, a 0.79 kg submarine sandwich moving 5.88 m/s to the left collides with a 0.14 kg grilled cheese sandwich moving 5 m/s to the right. If the two sandwiches stick together, what is their final velocity?

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INSTANT ANSWER

What average force is necessary to bring a 1.29 kg sled from rest to a speed of 7.58 m/s in a period of 8.07 s? Assume frictionless ice.

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An object of mass 9.66 kg is allowed to fall from rest under the force of gravity for 5.10 s. What is the change in its momentum? Ignore air resistance

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In the figure, four point masses are placed as shown. What is the x-coordinate of the center of mass of this arrangement if particle A has mass 4 kg, particle B has mass 14 kg, particle C has mass 12 kg, and particle D has mass 14 kg? Refer from the origin.

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Particle A is located 10 cm from a set origin and has a mass of 20 g. Particle B has a mass of 78 g. Where must particle B be located if the center of mass is located 38 cm from the set origin? Express answers in centimeters.

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