Brooke L

Can somebody pleassee help explain this to me?

An automobile engine slows down from 4800 rpm to 1100 rpm in 3.5 s.

(a) Calculate its angular acceleration, assumed constant.

__ rad/s2

(b) Calculate the total number of revolutions the engine makes in this time.

__ rev

I have slight idea of how this goes, i drew the picture but im stuck after that

A 0.180 kg block on a vertical spring with spring constant of 4.35 103 N/m is pushed downward, compressing the spring 0.091 m. When released, the block leaves the spring and travels upward vertically. How high does it rise above the point of release?

_m

does anyone know how to do gravitational potential energy?

A 2.1 kg ball is attached to a ceiling by a string. The distance from the ceiling to the center of the ball is 0.87 m, and the height of the room is 3.00 m.

(a) What is the gravitational potential energy associated with the ball relative to the ceiling?

__ . J

(b) What is the gravitational potential energy associated with the ball relative to the floor?

__ . J

(c) What is the gravitational potential energy associated with the ball relative to a point at the same elevation as the ball?

__ J

PHYSICS Kenematics (Sailboat)?

Anyone know how to do this? is a review for final and lost notes from begining of year.

A sailboat starts from rest and accelerates at a rate of 0.17 m/s2 over a distance of 208 m.

(a) Find the magnitude of the boat's final velocity.

__ m/s

(b) Find the time it takes the boat to travel this distance.

__ s

A 960 N crate is being pulled across a level floor by a force F of 355 N at an angle of 34° above the horizontal. The coefficient of kinetic friction between the crate and the floor is 0.25. Find the magnitude of the acceleration of the crate.

__m/s2

A 84 kg clock initially at rest on a horizontal floor requires a 668 N horizontal force to set it in motion. After the clock is in motion, a horizontal force of 506 N keeps it moving with a constant velocity.

(a) Find μs between the clock and the floor.

__

(b) Find μk between the clock and the floor.

__

A rocket moves upward, starting from rest with an acceleration of 32.6 m/s2 for 5.76 s. It runs out of fuel at the end of the 5.76 s but does not stop. How high does it rise above the ground?

__ m

Anyone know how to do this? is a review for final and lost notes from begining of year.

A sailboat starts from rest and accelerates at a rate of 0.17 m/s2 over a distance of 208 m.

(a) Find the magnitude of the boat's final velocity.

__ m/s

(b) Find the time it takes the boat to travel this distance.

__ s

Can someone please give me an example to know how to do this problem? im so confused

A ball on the end of a string is revolved at a uniform rate in a vertical circle of radius 80.0 cm. Its speed is 4.30 m/s and its mass is 0.300 kg.

(a) Calculate the tension in the string when the ball is at the top of its path.

__ N

(b) Calculate the tension in the string when the ball is at the bottom of its path.

__N

Are there any geniuses that know how to do this problem? Can't figure it out at all!

A child sitting 1.16 m from the center of a merry-go-round moves with a speed of 1.40 m/s.

(a) Calculate the centripetal acceleration of the child.

__ m/s2 --Direction-- toward the center away from the center or tangent to the circular path

(b) Calculate the net horizontal force exerted on the child (mass = 25.0 kg).

__ N --Direction-- toward the center away from the center or tangent to the circular path

Does anyone know how to do this problem??

A bucket of mass 1.20 kg is whirled in a vertical circle of radius 1.00 m. At the lowest point of its motion the tension in the rope supporting the bucket is 25.0 N.

(a) Find the speed of the bucket.

__m/s

(b) How fast must the bucket move at the top of the circle so that the rope does not go slack?

__ m/s

Don't know how to put the friction into all of the steps. any help?

A 1080 kg car rounds a circular turn of radius 18.4 m. If the road is flat and the coefficient of static friction between the tires and the road is 0.60, how fast can the car go without skidding?

___ m/s

Please pleaase help me figure this problem out, i just need an example so i know how to do these types of problems. thank u so much any help will be voted best answer!

A rotating merry go-round makes one complete revolution in 3.8 s

(a) What is the linear speed of a child seated 1.3 m from the center?

__ m/s

(b) What is her acceleration (give components)? tangential acceleration 2 m/s2

radial acceleration __ m/s2

really really need help understanding this. its due at midnight tonight and i need the grade in this class because i was sick and missed the lessons. any help will be greatly appriciated. i will vote best answer for any help. thank you so much!

A grinding wheel 0.63 m in diameter rotates at 2200 rpm.

(a) Calculate its angular velocity in rad/s.

__ . rad/s

(b) What are the linear speed and acceleration of a point on the edge of the grinding wheel? linear speed __ m/s

radial acceleration __ . m/s2

Pleease please help me figure out this problem. ive been getting it wrong and i really need help learning this stuff beccause i was absent. any help at all will be voted best answer. thank u so much!

(a) What is the tangential acceleration of a bug on the rim of a 9.0 in. diameter disk if the disk moves from rest to an angular speed of 78 revolutions per minute in 4.0 s?

_ m/s2

(b) When the disk is at its final speed, what is the tangential velocity of the bug?

_ m/s

(c) One second after the bug starts from rest, what is its tangential acceleration?

_ m/s2

What is its centripetal acceleration?

_ . m/s2

What is its total acceleration?

_ m/s2

6 ° (relative to the tangential acceleration)

Very lost with this stuff, can you please help me with this one problem so i have an example to go from?

Consider a level flight turn of a propeller-driven airplane in which the airplane makes a complete circular turn in 2.0 min. If the plane's speed is 180 m/s, what is the radius of the circle?

__ m

What is the centripetal acceleration of the plane?

__ m/s2

A child rolls a ball on a level floor 3.8 m to another child. If the ball makes 11.0 revolutions, what is its diameter?

__ m

No idea how to do these problems, any help??

An automobile engine slows down from 4500 rpm to 1100 rpm in 4.5 s.

(a) Calculate its angular acceleration, assumed constant.

__ rad/s2

(b) Calculate the total number of revolutions the engine makes in this time.

__ rev

Had to make up a hard problem for class. try and figure it out:)

A box of books weighing 363 N is shoved across the floor by a force of 471 N exerted downward at an angle of 35° below the horizontal.

If μk between the box and the floor is 0.58, how long does it take to move the box 5.60 m starting from rest?

__ s

(b) What is the maximum coefficient of kinetic friction between the box and the floor that allows the box to move from this applied force.

__

I drew the diagram and everything in the end i got 2.22 s but it was wrong. dont know what i did wrong.

A football is kicked at ground level with a speed of 40.0 m/s at an angle of 33.0° to the horizontal. How much later does it hit the ground?

____ s