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3 years ago

How much work can a 22kw car engine do in 60 seconds

Physics

2 answers:

const2013 [10]3 years ago

8 0

Answer:

Work done = 1320000J or 1.32 × 10^6J

Explanation:

power =22kw = 22000w

Time = 60seconds

From: power = work done/ Time

work done = power × time

work done = 22000 × 60

work done = 1320000J or 1.32 ×10^6 J

Sindrei [870]3 years ago

6 0

Answer:

13.2 x 10^5 J

Explanation:

Power = work/time

Given

Power = 22kw

= 22 x 1000 = 22000w

Time = 60 secs

Therefore

22000 = work/60

Cross multiply

Work = 22000 x 60

= 1320000

= 13.2 x 10^5J

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A 100-kg athlete is performing a vertical leap to test his leg strength. He leaves the ground at 3.20 m/s, zooms upward to some

MaRussiya [10]

Answer:

2687.7 N

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

When he will reach the ground his speed will be 3.2 m/s but will travel 30 cm down

$v^2-u^2=2as\\\Rightarrow a=\frac{v^2-u^2}{2s}\\\Rightarrow a=\frac{0^2-3.2^2}{2\times 0.3}\\\Rightarrow a=-17.067\ m/s^2$

Force

$F=m(g-a)\\\Rightarrow F=100\times (9.81-(-17.067))\\\Rightarrow F=2687.7\ N$

The force on the legs will be 2687.7 N

5 0

4 years ago

Two train whistles have identical frequencies of 180 Hz. When one train is at rest in the station and the other is moving nearby

Ierofanga [76]

Answer:

-3.77 m/s

3.85 m/s

Explanation:

given that

Frequency at stationary = 180 Hz

Beat frequency = 2 Hz

Using Doppler effect, we know that

f' = f[(v ± v0) / (v ± vs)], where

v = speed of sound, 343 m/s

v0 = speed of the observer, 0

vs = speed of light, ?

f = stationary frequency, 180 Hz

f' = stationary ± beat frequency, 180 ± 2

Applying the formula, we have

f' = f[(v ± v0) / (v ± vs)]

182 = 180 [(343 + 0) / (343 + vs)]

182/180 = 343 / 343 + vs

343 + vs = 343 * 180/182

343 + vs = 339.23

vs = 339.23 - 343

vs = -3.77 m/s

Again, using

f' = f[(v ± v0) / (v ± vs)]

178 = 180 [(343 + 0) / (343 + vs)]

178/180 = 343 / 343 + vs

343 + vs = 343 * 180/178

343+ vs = 346.85

vs = 346.85 - 343

vs = 3.85 m/s

7 0

3 years ago

How many common phases of matter are there? A. Four B. Eight C. Five D. Three

kirill115 [55]

three
SLG
solid
liquid
gas

3 0

3 years ago

An eagle carries a fish up 50 m into the sky using 90 N of force. How much work did the eagle do on the fish? (Work: W = Fd)

Olin [163]

W=Fd so W=50(90)=4500J
4500J is your answer

4 0

3 years ago

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True of false. An advantage of electromagnets is they can be switched on and off.

vazorg [7]

Answer:

True

Explanation:

Electromagnets can be switched on and off

8 0

3 years ago

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