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Montano1993 [528]
4 years ago
12

A 35-N bucket of water is lifted vertically 3.0m and then returned to its original position. How much work did gravity do on the

bucket during this process? (a)180J (b) 90J (c) 45J (d) 0J (e) 900J
Physics
1 answer:
Serjik [45]4 years ago
7 0

Answer:

Work done, W = 0 J

Explanation:

It is given that,

Weight of the bucket, W = F = 35 N

It is lifted vertically 3 m and then returned to its original position. We need to find the work gravity do on the bucket during this process.

Work done when the bucket is lifted vertically, W₁ = -mgh

Work done when the bucket returned to its original position, W₂ = +mgh

Net work done, W = W₁ + W₂

W = 0 J

So, the work done on the bucket is zero. Hence, this is the required solution.

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Which of the following best explains why snow predictions by meteorologists are sometimes incorrect?
den301095 [7]

Answer:

C. Interference from the sun causes data to be collected inaccurately.

Explanation:

Snow predictions by meteorologists are sometimes incorrect because from the sun causes data to be collected inaccurately.

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3 years ago
Systemic circulation requires help from which of the following bones, lungs, arteries and veins, or muscles
ahrayia [7]
Systemic circulation is between the heart and the rest of the body. Therefore arteries and veins are needed.
4 0
3 years ago
Rick shoots a basketball at an angle of 35' from the horizontal. It leaves his hands 7 feet from the ground with a velocity of 2
Korvikt [17]

Given:

The angle of projection of the basketball, θ=35°

The height at which the ball leaves the hand, h=7 ft

The initial velocity of the basketball, v=20 ft/s

To find:

The parametric equations describing the shot.

Explanation:

The range, x of the basketball is given by,

x=v\cos\theta t

On substituting the known values,

\begin{gathered} x=20\times\cos35\degree\times t \\ \implies x=16.4t \end{gathered}

The change in the height, y of the basketball is given by,

y=-v\sin\theta t+\frac{1}{2}gt^2

Where g is the acceleration due to gravity.

On substituting the known values,

\begin{gathered} y=-20\times\sin35\degree\times t+\frac{1}{2}\times32\times t^2 \\ \implies y=-11.5t+16t^2 \end{gathered}

Final answer:

The parametric equations describing the shot are

\begin{gathered} \begin{equation*} x=16.4t \end{equation*} \\ \begin{equation*} y=-11.5t+16t^2 \end{equation*} \end{gathered}

8 0
1 year ago
How does sound travel from its source to your ear?
swat32
B. By vibrations in wires or strings
5 0
3 years ago
Read 2 more answers
*PHYSICS HELP*
sveta [45]
My calculator is about 1cm thick, 7cm wide, and 13cm long.

Its volume is (length) (width) (thick) = (13 x 7 x 1) = 91 cm³ .

The question wants me to assume that the density of my calculator
is about  the same as the density of water.  That doesn't seem right
to me.  I could check it easily.  All I have to do is put my calculator
into water, watch to see if sinks or floats, and how enthusiastically. 
I won't do that.  I'll accept the assumption.

If its density is actually 1 g/cm³, then its mass is about 91 grams.

The choices of answers confused me at first, until I realized that
the choices are actually 1g, 10² g, 10⁴ g, and 10⁶ g.

My result of 91 grams is about 100 grams ... about 10² grams.

Your results could be different.
3 0
3 years ago
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