3 years ago

He conducted experiments in combining elements

Physics

1 answer:

Wewaii [24]3 years ago

3 0

Where is the rest .........

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Find the volume of a box measuring 2 cm by 7 cm by 3 cm.

motikmotik

Answer:42 cm 3 cubic unit

Explanation:

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Listed below are four activities. In which activity is friction useful?

Likurg_2 [28]

Answer:

a. climbing up a cliff

Explanation:

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2 years ago

The efficiency of a squeaky pulley system is 73 percent. The pulleys are usedto raise a mass to a certain height. What force is

larisa86 [58]

The efficiency of the machine is defined as

$\eta = \frac{W_{out}}{W_{in}}$

Here

Work out is the work output and Work in is the work input

To find the Work in we have then

$W_{in} = \frac{W_{out}}{\eta}$

$W_{in} = \frac{mgh}{\eta}$

Replacing with our values

$W_{in} = \frac{(58)(9.8)(3)}{73\%}$

$W_{in} = 2335.89J$

The work done by the applied force is

W = Fd

Here,

F = Force

d = Distnace

Rearranging to find F,

$F = \frac{W}{d}$

$F = \frac{2335.89J }{18}$

F = 129.77N

Therefore the force exerted on the machine after rounding off to two significant figures is 130N

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3 years ago

You throw a ball straight up from the edge of a cliff. It leaves your hand moving at 12.0 m/s. Air resistance can be neglected.

Levart [38]

Answer:

y = 3.159 m

Explanation:

Using the second equation of motion.

s = ut + 0.5at^2 .......1

Since the ball is thrown upward the acceleration due to gravity act against it.

Given:

distance s = y

Initial speed u = 12.0 m/s

Time t = 0.30 s

Acceleration a = -g = -9.8m/s^2

Equation 1 becomes;

y = ut - 0.5at^2

Substituting the given values. We have;

y = 12.0(0.30) - 0.5(9.8 × 0.3^2)

y = 3.6 - 0.441

y = 3.159 m

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3 years ago

Assuming that voltage remains constant, what happens to the current in a wire as its diameter decreases? A. The current is not a

kondaur [170]

Answer:

<em> The current decreases.</em>

Explanation:

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