Einstein

This page lists questions and answers that were posted by visitors named Einstein.

Questions

The following questions were asked by visitors named Einstein.

A car is driven at a constant speed of 21 m/s (76km/h) down a road. The car's engine delivers 52 kW of power. Calculate the average force of friction that is resisting the motion of the car. My thinking: Convert 52 kW to 5200 W. Force of friction = force...

An experimental train has a mass of 1.70e4 kg and is powered across a level track by a jet engine that produces a thrust of 4.90e5 N for a distance of 520 m. a) Find the change in kinetic energy. b) Find the final kinetic energy of the train if it started...

A 20.0 kg cart is moving with a velocity of 7.30 m/s down a level hallway. A constant force of -11.0 N acts on the cart and its velocity becomes 3.50 m/s. a) What is the change in kinetic energy of the cart? b) How much work was done on the cart? c) How f...

An archer puts a 0.28 kg arrow to the bow string. An average force of 200 N is exerted to draw the sting back 1.1 m. a) Assuming no frictional loss, what speed does the arrow leave the bow? b) If the arrow is shot straight up, how high does it rise? My th...

A rifle is fired in a valley with parallel vertical walls. The echo from one wall is heard 1.0s after the rifle was fired. The echo from the other wall is heard 1.0s after the first echo. How wide is the valley?

Carol drops a stone into a mine shaft 12.6 m deep. How soon after she drops the stone does she hear it hit the bottom of the shaft?

One closed pipe organ has a length of 2.5 m. The frequency of the note is 34.3 Hz. When a second pipe is played at the same time, a 1.7 Hz beat note is heard. By how much is the second pipe too long? Would you have to use the frequency of the second pipe...

A 65 kg dancer leaps .32 m high. a) With what momentum does the dancer reach the ground? b) What impulse is needed to make a stop? c) As the dancer lands, the knees bend, lengthening the stopping time to .050 s. Find the average force exerted on the body....

Rachel pulls her 13 kg suitcase at a constant speed by pulling on a handle that makes an angle x with the horizontal. The frictional force on the suitcase is 28 N and Rachel exerts a 44 N force on the handle. a) What angle does the handle make with the ho...

The velocity of the transverse waves produced by an earthquake is 7.2 km/s, while that of the longitudinal waves is 4.2 km/s. A seismograph records the arrival of the transverse waves 68 s before that of the longitudinal waves. How far away was the earthq...

A constant net force of 406 N, up, is applied to a stone that weighs 33 N. The upward force is applied through a distance of 2.4 m, and the stone is then released. To what height, from the point of release, will the stone rise? Thoughts: F = ma. Would the...

A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers?

A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers? I was given this reply: The air force on the prop blades is what accelerates the helicopter upward. Use good old Newton's second law: F = M a Con...

I am working on an oral presentation on Dorothy Parker for my creative writing class. I am required to focus on her non-fiction work. I have researched her endlessly and have come up with nothing. Everything that I am finding concerns her poems and short...

What is the answer to 14m= cm

dear Ms.Sue what do they mean when they say find the tiime lapse.

here is the problem Ms.Sue 6:32,9:29.

Ms.Sue the answer is 2:47.I'm sorry for taking so long.

In the Supreme Court case Worcester v. Georgia (1832), the Court declared that Georgia’s laws _____ within Cherokee territory.

Believing they had no choice, most Native American leaders in the Southeast signed treaties giving up their lands in the 1820s and 1830s. They agreed to move west to what was called the Indian Territory in present-day _____.

Answers

The following answers were posted by visitors named Einstein.

The mine shaft is 122.6 m deep. How do I find time?

Yes, I am supposed to use 343 m/s so: (343)(1)(.5)+(343)(2)(.5)=514.5 m/s

The mine shaft is 122.6 m deep. How do I find time?

A) Momentum = (2.465)(65) = 160.222 kgm/s B) 160.222 kgm/s C) Force = 160.222/.050 = 3204.441 N D) 3204.441/[(65)(9.8)] = 5.031

Thanks for your help.

D = 685.44 km Thanks a lot!!

Substitute y = 0 for x -intercept and solve for y

y-5>-14 add 5 both sides y-5+5 > -14 + 5 y > -9 set of values is y greater than -9

I believe the units for latent heat are kJ/kg. so should ur answer be in kJ/(kg*km^2)? I don't understand the rest of the problem though.

Ms.Sue the answer is 2:47.And i'm sorry for taking so long.

You're in Mr. Moyer's Bio 205 class at WWU? If you check out page 317 of our book it really helps! "The bulk of the human genome is made of non-coding and repetitive nucleotide sequences" or junk. Hope that helps! Good luck tomorrow :)

I don't frickin know that's why im here to scheme answers not to give

1.C 2.C 3.D 4.A 5.C

why are you guys talking about me

PE going into the down side: mgH KE is translational, and rotational or mgH=1/2 m v^2 + 1/2 Imr^2*w^2 mgH=1/2 m v^2 + 1/2 (1/2)mr^2*w^2 but when rolling, w=v/r mgH=1/2 m v^2+1/4*mv^2 =3/4mv^2 On the second side, rolling doesn t happen, the shell just spin...

PE going into the down side: mgH KE is translational, and rotational or mgH=1/2 m v^2 + 1/2 Imr^2*w^2 mgH=1/2 m v^2 + 1/2 (1/2)mr^2*w^2 but when rolling, w=v/r mgH=1/2 m v^2+1/4*mv^2 =3/4mv^2 On the second side, rolling doesn t happen, the shell just spin...

thanks, everyone who answered the question

d = Vo*T. Vo = 52km/h = 52,000m/3600s. = 14.44 m/s. d = 14.44 * 0.701 =

the answer is 2.5 ft/s ask me for the solution!

My calculations are . . . precise.