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3 years ago

A box of groceries requires five newtons of force to lift it one meter to the counter. How many joules of work is done?

Physics

1 answer:

lys-0071 [83]3 years ago

3 0

$Given:\\F=5N\\s=1m\\\\Find:\\W=?\\\\Solution:\\\\W=Fs\\\\W=5N\cdot 1m=5J$

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You throw a ball straight up. The ball has an initial speed of 11.2 m/s when it leaves your hand What is the maximum height the

Jet001 [13]

Answer:

Explanation:

Given

initial velocity $u=11.2\ m/s$

At maximum height velocity of ball is zero

using

$v^2-u^2=2as$

where v=final velocity

u=initial velocity

a=acceleration

s=displacement

$(0)^2 -(11.2)^2=2\times (-9.8)\times (s)$

$s=\frac{11.2^2}{2\times 9.8}$

$s=6.4$

time taken by the ball to reach the maximum height

$v=u+at$

$0=11.2-9.8\times t$

$t=\frac{11.2}{9.8}$

$t=1.142\ s$

At $t=2\ s$ height of ball is

$h=ut+\\frac{1}{2}at^2$

$h=11.2\times 2-\frac{1}{2}9.8\times (2)^2$

$h=22.4-19.6$

$h=2.8\ m$

i.e. ball is moving downward

height at $v=5\ m/s$

$v^2-u^2=2as$

$s=\frac{25-125.4}{2\times (-9.8)}$

$s=5.12\ m$

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Electric current is the flow of charged particles called blank .

uysha [10]

The electric current is measured in coulombs per second. A flow of one coulomb per second is called one ampere

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Fynjy0 [20]

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34kurt

Answer:

D. a heat engine that uses heat to do work

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Alexandra [31]

Answer:

Right hand rule

Explanation:

The rule by which the direction of a rotational vector can be found: take your right hand, curl your fingers and stick your thumb straight up. If you let the curl of your fingers follow the path of the rotating particle or body, your thumb will point in the direction of the angular velocity of the body.

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