10/26/20

Unit Circular Motion and Total Energy
How would one find the total energy of a ball being swung in a vertical circle? In this case the floor is being used as the zero point for gravitational potential energy. In this example, the ball... more
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10/26/20

solve for the angle
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10/26/20

Solve for the angle
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10/26/20

What is the acceleration of a baseball when its speed increases from 1 m/sec to 25 m/sec in 1 second?
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10/26/20

A car is driving at 25 m/s when the driver sees a sign indicating the speed limit has dropped to 15 m/s. It takes the car 4 seconds to slow down to the correct speed. What was the car's acceleration?
Hint: A formula is needed.
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10/26/20

physics question - dynamic fluids
Water passes through a main pipe with a flow rate of 8.11 m3/s. The water flow is then equally broken up into 4 smaller pipes, each of radius 25.9 cm. How fast is the water traveling through each... more
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10/26/20

physics question
The density of seawater is 1023 kg/m^3, what is the change in pressure ∆P for a diver going from a depth of 70.7 m to a depth of 48.3 m? Enter units of Pa.
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10/26/20

In NFL tryouts, a player waits at the starting line, and then accelerates at 4 m/s^2 when the coach yells "go". How fast are they going at the end of the 40 m dash?
Hint: A formula is needed.
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10/26/20

A model rocket is launched from a raised platform...
Its height in feet is given by h(t) = -8t^2 +288t + 40 (t = seconds after launch.)A: After how many seconds does the object reach its maximum height?B: What is the maximum height?
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10/26/20

Hey, could you help me?

A gift shop had 500 coloring pencils. The shop sold 3 sets of 20 coloring pencils, 6 sets of 12 coloring pencils, and 10 sets of 18 coloring pencils. Write a numerical expression to show how many... more
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10/26/20

Suppose the m∠YES = 113°
What is the measure of the angle that is complementary to ∠YES?What is the measure of the angle that is supplementary to ∠YES?
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10/26/20

What is the measure of these angles?

Suppose m∠TOK = 49°Part A: What is the measure of the angle complementary to m∠TOK ?Part B: What is the measure of the angle supplementary to m∠TOK ?
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10/26/20

One gear wheel turns another, the teeth being on the rims. The wheels have 50 cm and 70 cm radii, and the smaller wheel rotates at 30 revolutions/minute. Find the angular speed of the larger...
wheel in radians per second. (Note: the wheels have the same liner speed.)
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10/26/20

The rear wheel of a tractor has a 24 inch radius. If it is traveling at 20 miles/hour, what is the angular speed of the wheel? What is the angle through which it rotates in 15 seconds?
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10/26/20

2 Block Atwood Machine Inclined Plane Problem
A block of mass mi is placed on an inclined plane with a slope angle and connected to a second hanging block m2 by a light string passing over a light frictionless pulley. The coefficients of... more
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10/26/20

Calculus natural science
A particle moves according to a law of motion s = f(t) = t3 - 12t2 + 45t, t 0, where t is measured in seconds and s in feet.a.When is the particle speeding up? (????,????)U(????,????)b.When is it... more
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10/26/20

acceleration of gravity

A wrench falls out of the gondola of a balloon that is 540 m above the ocean.Assuming negligible air resistance, what was the wrench’s speed as it hit the water? The acceleration of gravity is 9.8... more
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10/26/20

Consider a rabbit that is at x=8.1m at t=0s and moves with a constant velocity of -1.6 m/s. What is the equation of motion for the rabbit?
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10/21/20

Object Rolling off a table top
An object rolls off a tabletop with a horizontal velocity v0x = 2.5 m/s. The table is at a height y0 = 0.55 m, above the floor. Use a coordinate system with its origin on the floor directly beneath... more
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10/21/20

 In the movie clip from Ice Age, dodo birds are chasing a watermelon that accidentally falls off a cliff
 In the movie clip from Ice Age, dodo birds are chasing a watermelon that accidentally falls off a cliff, The watermelon has a horizontal velocity of 8.0 m/s. It is in free fall for 6.0s. How far... more
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10/19/20

physics question
You keenly measure the angular momentum of a ball of mass 0.405 kg to have a magnitude of 16.7 kg·m2/s. The ball is 7.93 m away from you and its direction of motion makes an angle of 17.38 degrees... more
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10/19/20

physics question
A person bending forward at the waist has a momentum of inertia of 6.05 kg·m2 relative to an axis of rotation placed underneath their feet. When that person is standing straight up, their moment of... more
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10/18/20

Physics Question
A 45.0-kg girl is standing on a 149-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a... more
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