4,365 Answered Questions for the topic Science

11/02/20

Please help me thank you!
A 1.98-kg particle has a velocity (2.01 î − 3.05 ĵ) m/s, and a 3.01-kg particle has a velocity (0.94 î + 5.93 ĵ) m/s.(a) Find the velocity of the center of mass. ______ î +  ____ ĵ m/s(b) Find the... more
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11/02/20

Help me please?
Romeo (85.0 kg) entertains Juliet (47.0 kg) by playing his guitar from the rear of their boat at rest in still water, 2.70 m away from Juliet, who is in the front of the boat. After the serenade,... more
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11/02/20

Help please with this problem?
A rod of length 20.00 cm has linear density (mass per length) given byλ = 50.0 + 20.5xwhere x is the distance from one end, and λ is measured in grams/meter.(a) What is its mass? _____g(b) How far... more
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11/02/20

can someone help with this please?
Four objects are situated along the y axis as follows: a 2.04-kg object is at +2.91 m, a 2.99-kg object is at +2.40 m, a 2.55-kg object is at the origin, and a 3.99-kg object is at -0.508 m. Where... more
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11/02/20

How can I solve this?
A 44.4-kg girl is standing on a 161-kg plank. Both originally at rest on a frozen lake that constitutes a frictionless, flat surface. The girl begins to walk along the plank at a constant velocity... more
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Science Math Physics

11/01/20

Solve the following problem and then upload it. A horse pulls a cart up a hill at an angle of 53 degrees. The horse pulls with a force of 2200 N parallel to the ground. The cart has a mass of 1340 kg.
Solve the following problem and then upload it. A horse pulls a cart up a hill at an angle of 53 degrees. The horse pulls with a force of 2200 N parallel to the ground. The cart has a mass of 1340... more
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Science Math Physics

11/01/20

A 1 kg block is being held at rest by friction on a ramp angled at 45 degrees above the horizontal.
A 1 kg block is being held at rest by friction on a ramp angled at 45 degrees above the horizontal. What is the magnitude of the force of friction acting on the block?
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Science Math Physics

11/01/20

You want to pull a 7 kg block up a frictionless ramp with an acceleration of 3.8 m/s2.
You want to pull a 7 kg block up a frictionless ramp with an acceleration of 3.8 m/s2. What force do you need to apply on the block along the direction of the ramp's surface if the ramp is angled... more
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Science Math Physics

11/01/20

A 9 kg block is resting on a ramp inclined at 30 degrees above the horizontal. What is the magnitude of the normal force acting on the block?
A 9 kg block is resting on a ramp inclined at 30 degrees above the horizontal. What is the magnitude of the normal force acting on the block?
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11/01/20

How can I solve this?
Starting from rest, a 62.0 kg woman jumps down to the floor from a height of 0.640 m, and immediately jumps back up into the air. While she is in contact with the ground during the time interval 0... more
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11/01/20

How can I solve this?
A ball falls from height of 19.5 m, hits the floor, and rebounds vertically upward to height of 15.0 m. Assume that m ball = 0.215 kg.(a)What is the impulse (in kg · m/s) delivered to the ball by... more
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11/01/20

How can I solve this?
At one particular moment, a 19.0 kg toboggan is moving over a horizontal surface of snow at 4.10 m/s. After 9.00 s have elapsed, the toboggan stops. Use a momentum approach to find the magnitude of... more
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10/30/20

What is the car's (centripetal) acceleration?
A race car rounds a curve at 53 m/s. The radius of the curve is 405 m, and the car's mass is 670 kg. (Assume the car's speed remains constant. Take the radially inward direction to be... more
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10/30/20

What is the radius of its orbit?
A centripetal force of 170 N acts on a 1,500-kg satellite moving with a speed of 4,700 m/s in a circular orbit around a planet. What is the radius of its orbit?
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Science Math Physics Algebra

10/29/20

What is the ball's centripetal acceleration?
A child attaches a rubber ball to a string and whirls it around in a circle overhead. If the string is 0.2 m long and the ball's speed is 16 m/s, what is the ball's centripetal acceleration?
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10/29/20

What is the slope?
A car is going 16 m/s for 15 s.What is the slope?
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10/29/20

Find its average speed.
A passenger jet flies from one airport to another 1,233 miles away in 2.2 h. Find its average speed.
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10/29/20

What is the period of the crystal's motion?
A quartz crystal vibrates with a frequency of 26,621 Hz. What is the period of the crystal's motion?
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10/29/20

What is the frequency (in Hz) of its oscillation?
A hypnotist's watch hanging from a chain swings back and forth every 0.68 s. What is the frequency (in Hz) of its oscillation?
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10/29/20

How does an inelastic collision between the wall and a spring (connected to a device) affect the spring constant?
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10/29/20

Block and ramp help
A block starts with a speed of 15 m/s at the bottom of a ramp that is inclined at an angle of 30 ̊ above the horizontal. The coefficient of kinetic friction between the block and the plan is 0.2.... more
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10/29/20

Roller coaster help
roller coaster has a mass of 840 kg. It is launched horizontally from a giant spring with spring constant 31,000 N/m into a frictionless vertical loop-the-loop track of radius 6.3 m. What is the... more
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10/29/20

Urgent help physics

You are driving your car uphill along a straight road. Suddenly you see a car run a red light and enter the intersection just ahead of you. You slam on your brakes and skid in a straight line to a... more
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Science Physics

10/29/20

How far does a car and a jet travel?
How far does a car going 23 m/s travel in 9 s? How far would a jet going 165 m/s travel in 9 s?
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Science Physics

10/29/20

A passenger jet flies from one airport to another 1,233 miles away in 2.2 h.
A passenger jet flies from one airport to another 1,233 miles away in 2.2 h. Find its average speed.
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