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antiseptic1488 [7]

2 years ago

6

Does the work required to lift a book to a high shelf depend on how fast you raise it? does the power required to lift the book

depend on how fast you raise it? explain.

1 answer:

tatiyna2 years ago

6 0

Answer:

No

Explanation:

According to the formula W=Fx, the work done only depends on the Force applied to the book(the gravitational force of the book) and the distance to lift, which is a constant. The velocity doesn't matter.

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What is the velocity in meters per second of a runner who runs exactly 110 m toward the beach in 72 seconds.

KATRIN_1 [288]

1.53 m/s toward the beach

Explanation:

The magnitude of the velocity of the runner is given by:

$v=\frac{d}{t}$

where

d is the displacement of the runner

t is the time taken

In this case, d=110 m and t=72 s, so the velocity of the runner is

$v=\frac{110 m}{72 s}=1.53 m/s$

Velocity is a vector, so it consists of both magnitude and direction: we already calculate the magnitude, while the direction is given by the problem, toward the beach.

3 0

3 years ago

Read 2 more answers

The second hand on a clock is 3.00 cm long. What is the speed of the outermost tip of that second hand

Gnom [1K]

In 60 minutes or 3600 seconds, the tip of the minute hand traverses the circumference of a circle with radius 3.00 cm, so it moves with a tangential speed of

(3.00 cm)/(3600 s) ≈ 0.00083 cm/s = 8.3 μm/s

4 0

3 years ago

Describe how a tornado can endanger property and people

BabaBlast [244]

Tornadoes are known for their force and strength. When it tornadoe touches ground, it rips up everything in its path, and can rarely suck up people. Some are very short, and others are very, very long.

7 0

3 years ago

Two identical loudspeakers separated by distance dd emit 200 Hz sound waves along the x-axis. As you walk along the axis, away f

uysha [10]

Answer:

The first possible value of d is 0.85 m

The second possible value of d is 2.55 m

The third possible value of d is 4.25 m

Explanation:

Given that,

Distance =d

Frequency of sound wave= 200 Hz

We need to calculate the wavelength

Using formula of wavelength

$\lambda=\dfrac{v}{f}$

Put the value into the formula

$\lambda=\dfrac{340}{200}$

$\lambda=1.7\ m$

The separation between the speakers in the destructive interference is

$\Delta x= d$

The equation for destructive interference

$2\pi\times\dfrac{\Delta x}{\lambda}-\Delta\phi_{0}=(m+\dfrac{1}{2})2\pi$

The loudspeakers are in phase

So, $\Delta\phi_{0}=0$

The equation for destructive interference is

$2\pi\times\dfrac{d}{\lambda}=(m+\dfrac{1}{2})2\pi$ ....(I)

Here, m = 0,1,2,3.....

We need to calculate the first possible value of d

For, m = 0

Put the value in the equation (I)

$2\pi\times\dfrac{d_{1}}{1.7}=(0+\dfrac{1}{2})2\pi$

$d_{1}=\dfrac{1.7}{2}$

$d_{1}=0.85\ m$

We need to calculate the second possible value of d

For, m = 1

Put the value in the equation (I)

$2\pi\times\dfrac{d_{2}}{1.7}=(1+\dfrac{1}{2})2\pi$

$d_{2}=\dfrac{1.7\times3}{2}$

$d_{2}=2.55\ m$

We need to calculate the third possible value of d

For, m = 1

Put the value in the equation (I)

$2\pi\times\dfrac{d_{3}}{1.7}=(2+\dfrac{1}{2})2\pi$

$d_{3}=\dfrac{1.7\times5}{2}$

$d_{3}=4.25\ m$

Hence, The first possible value of d is 0.85 m

The second possible value of d is 2.55 m

The third possible value of d is 4.25 m

3 0

3 years ago

The total volume in milliliters of a glucose-water solution is given by the equation below: V = 1001.93 + 111.5282m + 0.64698m2

Ostrovityanka [42]

Answer:

111.657596

Explanation:

The expression of volume is given by

$V=1001.93+111.5282+0.64698m^2$

Partially differentiating the term we get

$\dfrac{\partial V}{\partial x}=\dfrac{\partial (1001.93+111.5282+0.64698m^2)}{\partial x}\\\Rightarrow \dfrac{\partial V}{\partial x}=111.5282+2\times 0.64698m\\\Rightarrow \dfrac{\partial V}{\partial x}=111.5282+1.29396m$

m = 0.100

$\dfrac{\partial V}{\partial x}=111.5282+1.29396\times 0.100\\\Rightarrow \dfrac{\partial V}{\partial x}=111.657596$

The partial molar volume of glucose is 111.657596

5 0

4 years ago