3 years ago

PLLLLLLLLLLLLLLLLZ HELP

Physics

1 answer:

Eduardwww [97]3 years ago

7 0

Answer:Two rays are required.

Explanation:If the object is at infinity image will be at principal focus.

And if the object is far away means twice at focal length then the image will be formed between focus and twice of principal focus.

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A 25.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 21.00 m. When she is partway do

____ [38]

Answer:

The mechanical energy lost due to friction is 2,424.5 J

Explanation:

Given;

mass of the child, m = 25 kg

intial velocity of the child, u = 0

final velocity of the child, v = 7.8 m/s

initial position of the child, h₁ = 21 m

final position of the child, h₂ = 8 m

Let the energy lost due to heat = ΔE

ΔE + ΔK.E + ΔP.E = 0

ΔE + ¹/₂m(v² - u²) + mg(h₂ - h₁) = 0

ΔE + ¹/₂ x 25(7.8² - 0) + 25 x 9.8(8 - 21) = 0

ΔE + 760.5 J - 3185 J =

ΔE - 2,424.5 J = 0

ΔE = 2,424.5 J

Therefore, the mechanical energy lost due to friction is 2,424.5 J

4 0

3 years ago

A sled whose total mass with cargo is 30.0 kg rests on ice. The coefficient of static friction is 0.20 and the coefficient of ki

romanna [79]

when sled just start to move the force on the sled will be equal to the static friction

So here we need to find the value of static friction

We know that

m = 30 kg

$\mu_s = 0.20$

now we know that normal force on the block is counterbalanced by weight of the block

$F_n = mg$

$F_n = 30*9.8$

now in order to find the friction force we can use

$F_s = \mu_s * F_n$

$F_s = 0.20 * 30 * 9.8$

$F_s = 59 N$

so it requires 59 N of force to move the sled

5 0

3 years ago

A mass of 2.50 kg is in a gravitational field of 14.0 N/kg. What force acts on the mass?

Olenka [21]

To determine the force that acts on the mass, just multiply the mass by the gravitational field. Using the given data,
F = (2.50 kg)(14 N/kg) = 35 N
Therefore, the force that acts on the mass is equal to 35 N.

7 0

3 years ago

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It takes less time to manually move patients than to use lift equipment. Is this statement a myth or fact?

sergejj [24]

Fact. Using lift equipment would take longer.

7 0

4 years ago

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A water skier has a mass of 79.0 kg and accelerates at 1.40 m/s2. What is the net force acting on him? F = ___ N

marysya [2.9K]

The answer is 111.

Using Newton's Second Law, F=ma, plugging known values in we get:

F = (79kg)(1.4m/s^2) = 110.6N ≈ 111N

5 0

3 years ago