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umka2103 [35]
3 years ago
9

A professor has to haul a cart up a ramp. The ramp has an angle of about 10 degrees and is about 5 meters long. His initial spee

d at the bottom of the ramp is 4.5 m/s, and the cart has a mass of about 80 kg. How hard does he have to push on the cart so that at the top of the ramp, its speed has not dropped below 3.6 m/s? Neglecting friction, what is the magnitude of the minimum force he has to exert on the cart?
Physics
1 answer:
horsena [70]3 years ago
5 0

Answer:

77.95 N

Explanation:

work done by force WF = F×L

work done by gravity Wg = -m×g×L×sinθ

initial kinetic energy Ki = (1/2)×m×vi^2

final kinetic energy Kf = (1/2)×m×vf^2

from work energy relation

net work = change in KE

W_tot = K_f - K_i

WF + Wg = K_f - K_i

F×L - mg×L×sinθ = (1/2)×m×(v_f^2 - v_i^2)

F×5 - 80×9.81×5×sin10 = (1/2)×80×(3.6^2-4.5^2)

force F = 77.95 N

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Anna11 [10]

Answer:

The correct answer is 0,2 rems

Explanation:

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The amount of radiation for a chest x-ray of an adult (0.01 rems) is approximately equal to 10 days of natural radiation to which we are all exposed every day.

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3 0
3 years ago
An Ethernet cable is 4.00m long. The cable has a mass of 0.200kg . A transverse pulse is produced by plucking one end of the tau
Mashcka [7]

Based on the length of the Ethernet cable and the mass, the tension in the cable can be found to be 80 N.

<h3>How much tension is in the cable?</h3>

The tension in the cable can be found as:

= 4 x mass x length x frequency

Solving for the frequency is:

= 1 / (0.800 / 4)

= 1 / 0.20

= 5.0 Hz

The tension is therefore:

= 4 x 0.20 x 4.00 x 5

= 80N

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4 0
1 year ago
Since the Wagon is being pulled down hill is it increasing (C)
Ket [755]
<em>Since the wagon is being pulled down hill with a constant velocity, all the forces of the wagon would be (C) increasing.</em>
<em>You are correct! **</em>
4 0
3 years ago
When we look up at the stars, we are seeing the future", is this astronomer correct ? Why or why not ?
Andrei [34K]

Answer:

if the stars connect to a thing, then it describes.

7 0
3 years ago
Answer all of them an you will get the brain list
Vlad [161]

Answer:

4. Force = 178.6 Newton.  

5. Acceleration = 2.28 m/s².

6. Force = 178.6 Newton.

Explanation:

4. Given the following data;

Acceleration = 3.8 m/s²

Mass = 47kg

Force = mass * acceleration

Force = 47 * 3.8

<em>Force = 178.6 Newton. </em>

5. Given the following data;

Force = 785N

Mass = 345kg

Acceleration = force/mass

Acceleration = 785/345

<em>Acceleration = 2.28 m/s²</em>

6. Given the following data;

Acceleration = 6m/s²

Force = 32N

Mass =force/acceleration

Mass = 32/6

<em>Mass = 5.33 kilograms </em>

5 0
2 years ago
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