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3 years ago

If you are doing a "rowing" motion, what muscle of the shoulder are you using?

1 answer:

6 0

The upper back muscles being worked while using a rowing machine .your upper trapezius and rhomboids located between your shoulder blades, and latissimus dorsi located beneath the armpits

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PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!

Gelneren [198K]

Work = force x distance (displacement) or the change in Kinetic energy

Carrying a box down a corridor has no external force acting on the box and therefore no work is being done.

Pushing against a locked door doesn't displace the door, so no work is being done.

Suspending a heavy weight with a strong chain requires, no force and actually prevents a force from acting on the chain.

Pulling a trailer up a hill on the other hand requires a person to apply a force to the trailer and displace it up the hill and therefore it requires work.

6 0

3 years ago

The kinetic energy of an object with a mass of 6.8 kg and a velocity of 5.0 m/s is J. (Report the answer to two significant figu

abruzzese [7]

Answer:

$\boxed{\sf Kinetic \ energy \ (KE) = 85 \ J}$

Given:

Mass (m) = 6.8 kg

Speed (v) = 5.0 m/s

To Find:

Kinetic energy (KE)

Explanation:

Formula:

$\boxed{ \bold{\sf KE = \frac{1}{2} m {v}^{2} }}$

Substituting values of m & v in the equation:

$\sf \implies KE = \frac{1}{2} \times 6.8 \times {5}^{2}$

$\sf \implies KE = \frac{1}{ \cancel{2}} \times \cancel{2} \times 3.4 \times 25$

$\sf \implies KE =3.4 \times 25$

$\sf \implies KE = 85 \: J$

8 0

4 years ago

Read 2 more answers

What is the formula for finding the lever arm factor?

cricket20 [7]

Lever arm is the distance between force of compression and force of tension in a beam, represented by z, and z = d-0.42n (as per Limit State Method) , where n is depth of neutral axis and d is effective depth of beam.

7 0

2 years ago

How can you make the work output of machine greater than the work input

ivolga24 [154]

Answer:

The only way to increase the work output is to increase the work input. You can't get more work out of a machine than you put into it. The moving parts of a machine must use some of the work input to overcome friction. Because of friction, the work output of a machine is always less than the work input.

Explanation:

5 0

2 years ago

A celebrity holds a press conference, which is televised

docker41 [41]

Answer:

The maximum distanced between the television viewer and celebrity is:

3586 km

Explanation:

First, we are going to calculate the time it takes sound to travel from the celebrity to the reporter:

How the sound's speed is 343 m/s, then:

x = vt and $t = \frac{x}{v}$

Where: x: the distance traveled by the sound

v: the sound's speed

t : time

then

t = 4.1/343 = 0.011953 seconds

This time is the same that the electromagnetic signal takes to travel from the celebrity to the television viewer. Considering that the electromagnetic signal travels to the light's speed and it is:

$V_{l} = 300000 km/s$

The maximum distanced between the television viewer and celebrity is:

x = vt

x = (300000km/s)(0.011953s ) = 3586 km

4 0

3 years ago