1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
hodyreva [135]
3 years ago
11

Please help me with this review question.

Physics
1 answer:
jolli1 [7]3 years ago
8 0

Answer:

28.7%

Explanation:

efficiency = work output /work input × 100

You might be interested in
You weigh 580 N on Earth. If you were to go to Mars, where its gravitational pull is 3 . 7 11 m /s 2 , what would you weigh? (Hi
andrew-mc [135]

Answer:

59.18 kg

Explanation:

use f=ma

f= 580 N

a = 9.8 m/s 2

weigh(m) doesn't change only force(F) changes

7 0
3 years ago
Read 2 more answers
A 0.2 kg block sliding on a horizontal table slows down from 25 m/s to 20 m/s. How much energy does the block lose due to fricti
Papessa [141]

Answer:

the kinetic energy lost due to friction is 22.5 J

Explanation:

Given;

mass of the block, m = 0.2 kg

initial velocity of the block, u = 25 m/s

final velocity of the block, v = 20 m/s

The kinetic energy lost due to friction is calculated as;

\Delta K.E= K.E_f - K.E_i\\\\\Delta K.E= \frac{1}{2}mv^2 -  \frac{1}{2}mu^2\\\\\Delta K.E= \frac{1}{2}m(v^2 -u^2)\\\\\Delta K.E= \frac{1}{2} \times 0.2 (20^2 - 25^2)\\\\\Delta K.E= -22.5 \ J

Therefore, the kinetic energy lost due to friction is 22.5 J

7 0
3 years ago
Read 2 more answers
The chemical symbol for the element calcium is Ca. What would be the symbol representing calcium atoms that have lost two electr
Kazeer [188]

Answer:

ca^{2 + }

Explanation:

In all atoms, the number of protons = number of electrons, as a result the atom is neutral. Losing or gaining electrons will make the atom electrically charged and we call an electrically charged atom an ion.

Ca 2+ would be the symbol because losing two negative electrons makes calcium's nucleus more positive by two protons.

5 0
3 years ago
Read 2 more answers
How many elements are in the mixture pictured?<br> A. 7<br> B. 4<br> C. 3<br> D. 2
alex41 [277]

Answer:

C: 3

Explanation:

Cause of the colors

5 0
2 years ago
PLEASE HELP!
Sidana [21]
I am pretty sure the answer would be a
3 0
3 years ago
Read 2 more answers
Other questions:
  • What is the distance fallen for a freely falling object 1 s after being dropped from a rest position? What is the distance for a
    9·1 answer
  • At t=10 ~\text{s}t=10 s, a particle is moving from left to right with a speed of 5.0 ~\text{m/s}5.0 m/s. At t=20 ~\text{s}t=20 s
    15·1 answer
  • In the simple Bohr model of the eighth excited state of the hydrogen atom, the electron travels in a circular orbit around a fix
    5·1 answer
  • A(n)... is a material that takes in a wave when the wave hits it
    8·1 answer
  • A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machi
    14·2 answers
  • An aluminum rod 17.400 cm long at 20°C is heated to 100°C. What is its new length? Aluminum has a linear expansion coefficient o
    7·1 answer
  • Describe what a convection current is in how it was material than the earth
    6·1 answer
  • Which of the following is the type of rock
    5·1 answer
  • Select the correct locations on the image.
    12·2 answers
  • A particle starts from rest and is acted on by a net force that does work at a rate that is proportional to the time t. The spee
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!