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3 years ago

The more POWER you use to move an object, the more work you do.

Physics

2 answers:

Genrish500 [490]3 years ago

8 0

Answer:

false, The <em>farther</em> you move an object, the more work you do.

Explanation:

hope this helps!

~evita

Finger [1]3 years ago

3 0

Answer:false

Work is done on an object when the object moves in the SAME direction in which the force is applied. If you pull at an angle instead of in the direction in which the object moves, MORE of your force does work. The FARTHER you move an object, the more work you do. ... Power is the RATE at which work is done.

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If the pitched ball was traveling 77 mph before stanton's bat hit it and 120 mph after his bat hit it, by what amount did the sp

Mice21 [21]

here we will use the concept of Newton's III law

as per Newton's III law the impulse given to the ball is same as the impulse lost by the bat

So here we will say

impulse gain by the ball = impulse lost by the bat

$m_1(v_f - v_i) = m_2(\Delta v)$

given that

$m_1 = 5 ounce$

$m_2 = 32 ounce$

For ball the change in speed will be

$v_f - v_i = (120 - 77)mph$

now from above equation

$5\times (120 - 77) = 32 \times \Delta v$

$\Delta v = 6.72 mph$

so speed of bat will decrease by 6.72 mph

3 0

3 years ago

In an experiment, 108 J of work was done on a closed system. During this phase of the experiment, 79 J of heat energy was added

amid [387]

Answer:

187 J

Explanation:

First Law of Thermodynamics :

ΔQ = ΔW + ΔU

ΔQ : Heat. If it added to system then positive and if it is rejected by system then negative.

ΔW : Work. If it done by the system then positive and if it is done on system then negative.

ΔU : Internal Energy. If it positive then temperature of system increased and if it is negative then temperature of system decreased.

ΔQ = 79 J

ΔW = - 108 J

ΔU = ?

substituting the value in the equation:

79 = -108 + ΔU

∴ ΔU = 187 J

7 0

3 years ago

What can a machine do?

zlopas [31]

Answer:

B. Make the work you do feel easier

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bixtya [17]

Answer:

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3 years ago

You throw a ball downward from a window at a speed of 2.0m/s. How far has it fallen in 3 seconds?

bekas [8.4K]

Let's just assume that you throw the ball with an initial speed of 2 m/s instead of dropping it like free falling.
a=9.81 m/s^2
Vi= 2 m/s
t= 3 x

we use the formula
d = (Vi)(t) + (1/2)(a)(t)^2
d= (2)(3) + (1/2)(9.81)(9)
d=50.145 m

3 0

3 years ago