# Einstein

Popular questions and responses by Einstein
1. ## Physics

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

2. ## Physics

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?

3. ## Physics

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

4. ## Math

waht are lapse

5. ## Physics

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

6. ## Physics

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

7. ## Social Studies

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 _____.

8. ## Social Studies

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

Is it 2:57

10. ## Math

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

11. ## Math

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

12. ## Math

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

13. ## math

What is the answer to 14m= cm

14. ## Creative Writing

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

15. ## Physics

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? I was given this reply: The

16. ## Physics

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

17. ## Physics

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

18. ## Physics

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

19. ## Physic

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.

20. ## Physics

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?

21. ## Physics

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

22. ## Physics

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

23. ## Physics

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

1. ## Maths

thanks, everyone who answered the question

posted on July 2, 2020
2. ## chemistry

47.6

posted on October 1, 2018
3. ## physics

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

posted on April 24, 2018
4. ## physics

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

posted on April 20, 2018
5. ## science

why are you guys talking about me

posted on March 23, 2018
6. ## math

x=3 and y=2

posted on June 9, 2017
7. ## Msth

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

posted on December 7, 2016
8. ## Physics

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

posted on October 13, 2016
9. ## chemistry

0.5 moles of methane

posted on May 22, 2016
10. ## physics

3.14 m/s

posted on November 6, 2014
11. ## biology

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 :)

posted on March 1, 2013
12. ## Math

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

posted on August 14, 2012
13. ## Physics

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.

posted on April 18, 2012
14. ## Algebra

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

posted on March 5, 2009
15. ## Alegebra

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

posted on March 5, 2009
16. ## Physics

D = 685.44 km Thanks a lot!!

posted on December 15, 2007
17. ## Physics

posted on December 14, 2007
18. ## Physic

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

posted on December 14, 2007
19. ## Physics

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

posted on December 6, 2007
20. ## Physics

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

posted on December 6, 2007
21. ## Physics

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

posted on December 6, 2007
22. ## Physics

Thank you!!

posted on November 15, 2007
23. ## Physics

Thank you!!

posted on November 15, 2007