Physics, 02.11.2019 23:31 sahaitong814

you and a friend move a grand piano across the living room, exerting 25 newtons of force and performing 175 joules of work. it takes you 14 seconds. how far did you move the piano? how much power did you generate, in watts (joules/sec)?

Answers: 1

Show answers

Answers

Answer from: j1theking18

The piano moved 7 meters.

The power generated was 12.5 Watts.

Explanation:

Work is defined as the force that is applied on a body to move it from one point to another.

When a net force is applied to the body or a system and this produces displacement, then that force is said to perform mechanical work.

In the International System of Units, work is measured in Joule. Joule is equivalent to Newton per meter.

The work is equal to the product of the force by the distance and by the cosine of the angle that exists between the direction of the force and the direction that travels the point or the object that moves:

Work = force*distance*cos (angle between the force and the displacement)

In this case, the angle between the force and the displacement is 0 degrees.

In this case, you know:

Work=175 JouleForce=25 NewtonsDistance=?Angle between the force and the displacement=0 degrees → cos (angle)=1

Replacing:

175 Joule=25 Newtons*distance*1

In this way, it is resolved to obtain:

$distance=\frac{175 Joule}{25 Newtons*1} =\frac{175 Newtons*meters}{25 Newtons*1}$

distance= 7 meters

The piano moved 7 meters.

Power is defined as the speed with which a job is performed. That is, power is the amount of work done for a unit of time:

$P=\frac{work}{time}$

Where P is the power developed by the force that performs the work and its unit of measure in the International System is the Watts (W), the unit of measure of work in the International System is Joule (J) and time during which the work is carried out, it has the unit of measure in the International System of seconds (s). So Watts is equivalent to $\frac{Joule}{second} =\frac{J}{s}$ .

So in this case:

$P=\frac{175 Joule}{14 seconds}$

P=12.5 $\frac{J}{s}$ =12.5 watts

The power generated was 12.5 Watts

Answer from: Quest

answer; (arch); good luck

Answer from: Quest

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem. $\begin{aligned} | \vec{v}| & = \sqrt{(\text{2.7 m/s})^2 + (\text{1.2 m/s})^2 } \\ & = 2.954 \text{ m/s} \end{aligned}$ to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.

Another question on Physics

Physics, 22.06.2019 04:50

*drag each tile to the correct location in the sequence* the table shows chronological events in the life of our sun, a medium-sized star. place the missing events into the correct rows of the table.

Answers: 3

Answer

Physics, 22.06.2019 14:00

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

Answers: 2

Answer

Physics, 22.06.2019 20:50

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.

Answers: 3

Answer

Physics, 23.06.2019 00:10

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.

Answers: 2

Answer

You know the right answer?

you and a friend move a grand piano across the living room, exerting 25 newtons of force and perform...

Questions