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
olga2289 [7]
3 years ago
11

A machine lifts a 35 kg object doing 6860 J worth of work. How much power is produced by the machine if it lifts the object in 4

seconds?
350 W
60025 W
27440 W
1715 W
Physics
1 answer:
timofeeve [1]3 years ago
5 0

Answer:

Explanation:

We need the power equation for this which is

P = Work/time

We have everything we need to solve this (the mass of the object is extra information):

P = 6860/4

P = 1715W

You might be interested in
A rock of mass 200 g is attached to a 0.75 m long string and swung in a vertical plane.
Ainat [17]

Hello!

a) Assuming this is asking for the minimum speed for the rock to make the full circle, we must find the minimum speed necessary for the rock to continue moving in a circular path when it's at the top of the circle.

At the top of the circle, we have:

- Force of gravity (downward)

*Although the rock is still connected to the string, if the rock is swinging at the minimum speed required, there will be no tension in the string.

Therefore, only the force of gravity produces the net centripetal force:

\Sigma F = F_g\\\\F_c = F_g\\\\\frac{mv^2}{r} = mg

We can simplify and rearrange the equation to solve for 'v'.

\frac{v^2}{r} = g\\\\v^2 = gr\\\\v = \sqrt{gr}

Plugging in values:

v = \sqrt{9.8 * 0.75} = \boxed{2.711 m/s^}

b)
Let's do a summation of forces at the bottom of the swing. We have:
- Force due to gravity (downward, -)

- Tension force (upward, +)

The sum of these forces produces a centripetal force, upward (+).

\Sigma F = T - F_g\\\\F_c = T - F_g\\\\\frac{mv^2}{r} = T - mg

Rearranging for 'T":
T =   \frac{mv^2}{r} +  mg\\\\

Plugging in the appropriate values:
T =  \frac{(0.2)(2.711^2)}{(0.75)} + 0.2(9.8) = \boxed{3.92 N}

5 0
1 year ago
Read 2 more answers
Name two examples of deposition.
Rashid [163]
The reverse of deposition is sublimation and hence sometimes deposition is called desublimation. One example of deposition is the process by which, in sub-freezing air, water vapor changes directly to ice without first becoming a liquid.
8 0
3 years ago
Read 2 more answers
What is a transfer a wave
makkiz [27]

Energy is transferred in a wave

Energy is transferred, but mass is not.
4 0
3 years ago
Read 2 more answers
A mover loads a 100 kg box into the back of a moving truck by
hammer [34]

Explanation:

Mechanical Advantage (MA)

MA=d1d2=FoutFin ; d1 is the distance of effort, d2 is the distance the object is moved

7 0
3 years ago
A railroad car of mass 2.50 3 104 kg is moving with a speed of 4.00 m/s. It collides and couples with three other coupled railro
ipn [44]

Answer:2.5 m/s

37.5KJ

Explanation:

Let u_1, u_2 , v_f be the initial velocity of rail road car ,coupled cars & Final velocity of system respectively.

m=2.50\times 10^{4}

Conserving momentum

mu_1+3mu_2=4mv_f

4m+6m=4mv_f

v_f=2.5 m/s

Therefore Final velocity of system is 2.5m/s

(b)Mechanical Energy lost =Initial Kinetic Energy -Final Kinetic Energy

Initial Kinetic Energy=\frac{1}{2}m\left ( 4^2\right )+\frac{1}{2}m\left ( 2^2\right )=14m J

Final Kinetic Energy=\frac{1}{2}4m\left ( 2.5^2\right )=12.5m J

Mechanical Energy lost=14m-12.5m=3.75\times 10^4=37.5 KJ

4 0
3 years ago
Other questions:
  • Discharge is not possible at ntp why​
    7·1 answer
  • An inductor in an LC circuit has a maximum current of 2.4 A and a maximum energy of 56 mJ.
    15·1 answer
  • <img src="https://tex.z-dn.net/?f=x%20%2B%205%20%3D%200.5%28x%20%20%2B%203%29%20%5E%7B2%7D%20" id="TexFormula1" title="x + 5 = 0
    8·1 answer
  • I need help with life a child is adopted and I’m a duck where is my left shoe
    15·2 answers
  • A sled of mass 8 kg slides along the ice. It has an initial speed of 4 m/s but
    7·1 answer
  • PLEASE HELP, PLS HELP...
    15·1 answer
  • When using a liquid as a solvent, what could be the state(s) of matter of the solute?
    11·2 answers
  • What are the characteristics of a blackbody radiator? Give an example.
    12·1 answer
  • What makes the planets gravity?
    12·1 answer
  • Suppose we have two planets with the same mass, but the radius of the second one is twice the size of the first one. How does th
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!