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3 years ago

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1 answer:

3 0

Lasers are important to help mankind in many different reasons. Some of these reasons include laser hair removal, some kinds of eye surgery, and lasers are said to help with the military in the near future. Laser hair removal is usually used for getting rid of unwanted hairs. And is just a easy alternative to regular waxing or doing it yourself. Some types of eye surgery require lasers to complete them successfully. This is usually very very precise as lasers get the job done at pin point accuracy. Besides medical uses the U.S. military have been testing laser weapons on battleships to attack or defend oncoming missiles. This will most likely replace small firing cannons or flares.

I hope this helped you.

Brainliest is always appreciated if you feel its deserved!

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पाल

fenix001 [56]

Answer:

1a- Malleable and Rigid

b- when glass is heated up, it can stretch like plastic, (sorry I can't think of a second one)

Explanation:

6 0

3 years ago

One kg of air contained in a piston-cylinder assembly undergoes a process from an initial state whereT1=300K,v1=0.8m3/kg, to a f

lutik1710 [3]

Answer:

1. Yes, it can occur adiabatically.

2. The work required is: 86.4kJ

Explanation:

1. The internal energy of a gas is just function of its temperature, and the temperature changes between the states, so, the internal energy must change, but how could it be possible without heat transfer? This process may occur adiabatically due to the energy balance:

$U_{2}-U_{1}=W$

This balance tell us that the internal energy changes may occur due to work that, in this case, si done over the system.

2. An internal energy change of a gas may be calculated as:

$du=C_{v}dT$

Assuming $C_{v}$ constant,

$U_{2}-U_{1}=W=m*C_{v}(T_{2}-T_{1})$

$W=0.72*1*(420-300)=86.4kJ$

8 0

4 years ago

The natural force that causes you to lose power as you climb a hill is known as inertia.

Juliette [100K]

Yeah your answer is correct

7 0

3 years ago

Read 2 more answers

A block of mass m 5.00 kg is

vekshin1

<span>a.
the force in the direction of movement
Fx = F x cosA*
Fx = 12 x cos25*
Fx = 10.88
m x a = 10.88
a = 10.88/5
a= 2.18 m/s^2
b.
when the block will be lifted off the floor and when the vertical component
Fy = mg
Fy = F x sin25*
Fy= 5 x 9.8
Fy= 115.94 N
c.
if Fx = ma
a = 115.94/5
a= 23.19 m/s^2
hope it helps
</span>

6 0

3 years ago

slader How much energy is required to move a 1040 kg object from the Earth's surface to an altitude four times the Earth's radiu

andrew-mc [135]

Answer:

ΔU = 5.21 × 10^(10) J

Explanation:

We are given;

Mass of object; m = 1040 kg

To solve this, we will use the formula for potential energy which is;

U = -GMm/r

But we are told we want to move the object from the Earth's surface to an altitude four times the Earth's radius.

Thus;

ΔU = -GMm((1/r_f) - (1/r_i))

Where;

M is mass of earth = 5.98 × 10^(24) kg

r_f is final radius

r_i is initial radius

G is gravitational constant = 6.67 × 10^(-11) N.m²/kg²

Since, it's moving to altitude four times the Earth's radius, it means that;

r_i = R_e

r_f = R_e + 4R_e = 5R_e

Where R_e is radius of earth = 6371 × 10³ m

Thus;

ΔU = -6.67 × 10^(-11) × 5.98 × 10^(24)

× 1040((1/(5 × 6371 × 10³)) - (1/(6371 × 10³))

ΔU = 5.21 × 10^(10) J

7 0

3 years ago