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A racing car has a mass of 1510 kg. What is its kinetic energy if it has a speed of 96 km/h? Assume that air resistance is negligible.

I have two more tries for this question. I tried 6958080-J and it was wrong.

so our theme is "say it..." and inside on the dividers it says things like say it loud, say it proud, say it together, etc. i need help on writing the opening page's story. any ideas?

our school is only 5 years old now.

A brick weighing 23.6 N being released from rest on a 1.00 m frictionless plane, inclined at an angle of 30.0°. The brick slides down the incline and strikes a second brick weighing 35.7 N.

(a) Calculate the speed of the first brick at the bottom of the incline.

____ m/s

(b) If the two bricks stick together, with what initial speed will they move along?

____ m/s

(c) If the force of friction acting on the two bricks is 5.0 N, how much time will elapse before the bricks come to rest?

____ s

(d) How far will the two bricks slide before coming to rest?

____ m

CAN YOU HELP ME? i've been trying this for an hour now and i keep getting it wrong. i only have one more guess :/

You pull your 18 kg suitcase at constant speed on a horizontal floor by exerting a 41 N force on the handle, which makes an angle θ with the horizontal. The force of friction on the suitcase is 30 N.

(a) What angle does the handle make with the horizontal?

__°

(b) What is the normal force on the suitcase?

Magnitude

__ N

(c) What is the coefficient of friction?

___

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information.

(a) Calculate the speed of a 110 kg person at the equator.

__ m/s

(b) Calculate the force needed to accelerate the person in the circle.

__ N

(c) Calculate the weight of the person.

__ N

(d) Calculate the normal force of Earth on the person, that is, the person's apparent weight.

__ N

An airplane traveling 1000 m above the ocean at 150 km/h is to drop a box of supplies to shipwrecked victims below.

(a) How many seconds before being directly overhead should the box be dropped?

14.2857 s

(b) What is the horizontal distance between the plane and the victims when the box is dropped?

___ m

I got a to be 14.2857, but I can't get b. I tried and it was wrong.

Help? :/

Assume that you have a mass of 41.0 kg and Earth has a mass of 5.97 multiplied by 10^24 kg. The radius of Earth is 6.38 multiplied by 10^6 m. (Use G = 6.67 multiplied by 10-11 N·m2/kg2.)

(a) What is the force of gravitational attraction between you and Earth?

___ N

(b) What is your weight?

___ N

Two bowling balls each have a mass of 6.3 kg. They are located next to each other with their centers 21.9 cm apart. What gravitational force do they exert on each other? (Use G = 6.67 multiplied by 10-11 N·m2/kg2.)

The instruments attached to a weather balloon have a mass of 4.8 kg. The balloon is released and exerts an upward force of 108 N on the instruments.

(a) What is the acceleration of the balloon and instruments?

Magnitude

___ m/s2

(b) After the balloon has accelerated for 10 s, the instruments are released. What is the velocity of the instruments at the moment of their release?

Magnitude

___ m/s

(c) What net force acts on the instruments after their release?

Magnitude

___ N

(d) When does the direction of their velocity first become downward?

___ s (after release)

I tried to figure out this problem but I just can't. I don't know what equations to use or anything. Help!

A 61 kg boy and a 46 kg girl use an elastic rope while engaged in a tug-of-war on an icy, frictionless surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.

An 881 kg (1947 lb) dragster, starting from rest, attains a speed of 25.5 m/s (57.1 mph) in 0.59 s.

(a) Find the average acceleration of the dragster during this time interval.

____ m/s2

(b) What is the magnitude of the average net force on the dragster during this time?

____ N

(c) Assume that the driver has a mass of 68 kg. What horizontal force does the seat exert on the driver?

____ N

A sled of mass 49.0 kg is pulled along flat, snow-covered ground. The static friction coefficient is 0.30, and the kinetic friction coefficient is 0.10.

(a) What does the sled weigh?

___ N

(b) What force will be needed to start the sled moving?

___ N

(c) What force is needed to keep the sled moving at a constant velocity?

___ N

(d) Once moving, what total force must be applied to the sled to accelerate it at 2.6 m/s2?

___ N

A force of 45.0 N accelerates a 5.0 kg block at 5.8 m/s2 along a horizontal surface.

(a) How large is the frictional force?

1 N

(b) What is the coefficient of friction?

After a day of testing race cars, you decide to take your own 1470 kg car onto the test track. While moving down the track at 10.0 m/s, you uniformly accelerate to 31.0 m/s in 10 s. What is the average net force that you have applied to the car during the 10 s interval?

http://s7.photobucket.com/albums/y263/imakola/?act...

this is the link that the question is from. like there's a table for it.

this is the question...

Find the average velocity in the time interval between 0.0 s and 2.0 s.

You and a friend each drive 50.0 km. You travel at 82.0 km/h; your friend travels at 100.0 km/h. How long will your friend wait for you at the end of the trip?

i don't know what formula i would use to do this :/

A cyclist maintains a constant velocity of +4.0 m/s. At time t = 0.0, the cyclist is +240 m from point A.

(a) Plot a position-time graph of the cyclist's location from point A at 10.0 s intervals for 60.0 s. (Do this on paper. Your instructor may ask you to turn in this graph.)

(b) What is the cyclist's position from point A at 30.0 s?

____ m

(c) What is the displacement from the starting position at 30.0 s?

____ m

i don't understand how to do this at all. i'd love the help. thank you!

A bag is dropped from a hovering helicopter.

(a) When the bag has fallen 2.5 s, what is the bag's velocity?

24.525 m/s

(b) how far has the bag fallen?

____ m

i just can't get the second part. i only have one more guess so it'd be amazing if you can help me out with it. thank you!

During a baseball game, a batter hits a high pop-up. If the ball remains in the air for 6.5 s, how high does it rise? Hint: Calculate the height using the second half of the trajectory.

A car with a velocity of 25 m/s is accelerated uniformly at the rate of 1.6 m/s2 for 6.8 s. What is its final velocity?