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3 years ago

1. Gwen exerts a 16 N horizontal force as she pulls a 32N sled across a cement

Physics

1 answer:

PSYCHO15rus [73]3 years ago

5 0

Answer:

3.6 N Kinetic friction

Explanation:

3 ) Ff = uk * Fn = 3.6 N

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A man 6 feet tall walks at a rate of 5 feet per second away from a light that is 15 feet above the ground. When he is 10 feet fr

harina [27]

Answer:

$\frac{25}{3}ft/s$

Explanation:

Height of man= 6ft

Height of light=1 5ft

Let BC=x and CD=y

BD=x+y

Triangle ABD and ECD are similar

When two triangles are similar then the ratio of their corresponding sides are equal

$\frac{AB}{EC}=\frac{BD}{CD}$

$\frac{15}{6}=\frac{x+y}{y}$

$\frac{5}{2}=\frac{x+y}{y}$

$5y=2x+2y$

$5y-2y=2x$

$3y=2x$

Differentiate w.r.t t

$2\frac{dx}{dt}=3\frac{dy}{dt}$

We have $\frac{dx}{dt}=5ft/s$

Substitute the value then we get

$2\times 5=3\frac{dy}{dt}$

$\frac{dy}{dt}=\frac{2\times 5}{3}=10/3ft/s$

Rate at which the tip of shadow is moving= $\frac{dx}{dt}+\frac{dy}{dt}$

Rate at which the tip of shadow is moving= $5+\frac{10}{3}=\frac{15+10}{3}ft/s$

Rate at which the tip of shadow is moving= $\frac{25}{3}ft/s$

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3 years ago

How are Earth and Venus similar? How is Venus different from Earth? (Provide two similarities and two differences.)

Alika [10]

Venus shares a similar size, surface composition, and has an atmosphere with a complex weather system. Venus is different from Earth because it spins the opposite direction of Earth and it’s rotation is very slow.

8 0

3 years ago

A small ball (mass of 0.5 kg) and a large brick (mass of 10 kg) are dropped from a height of 5 meters. Both items are released a

Anna71 [15]

Explanation:

neglecting air resistance both will land at the same moment.

both have therefore the same acceleration.

7 0

3 years ago

Read 2 more answers

What is the kinetic energy of a 0.50 kg ball traveling at 120 m/s

MatroZZZ [7]

Answer:

3600 J

Explanation:

Kinetic energy of an object is the energy posses by an object solely due to its motion.

It can also be defined as the amount of work that can be done when an moving object come to test.

Kinetic energy of an object can be calculated by the equation,

K.E. = ½mv²

Where m = mass, v = velocity

So you get,

K.E. = ½×0.5×(120)² = 3600 J

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3 years ago

Which of the following is an example of an indirect tax?

Brrunno [24]

Answer:Sales tax, value-added tax, excise tax, and customs duties are examples of indirect taxes.

Explanation:

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3 years ago