3 years ago

Carlota does 2000 J of work on a machine. The machine does 500 J of work. What is the efficiency of the

Physics

2 answers:

jeyben [28]3 years ago

7 0

I am pretty sure it’s 75%

BARSIC [14]3 years ago

6 0

Answer:

25%

Explanation:

500 J out of 2000 J is 25%

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2 years ago

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3 years ago

A car moves with constant acceieration of -0.s m/s? on a straight portion of the road. Att- 0s the car has a velocity of 69 mph,

Crazy boy [7]

Answer:

b) d = 0.71 Km

Explanation:

Car kinematics

Car 1 moves with uniformly accelerated movement

$v_f^2=v_o^2+2a*d$ Formula (1)

d: displacement in meters (m)

v₀: initial speed in m/s

vf: final speed in m/s

a: acceleration in m/s²

Equivalences:

1mile = 1609.34 meters

1 hour = 3600s

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Known data

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Distance calculation

We replace data in the Formula (1)

$15.4^2 = 30.8^2+2(-0.5)*d$

$2(0.5)*d = 30.8^2 - 15.4^2$

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3 years ago