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3 years ago

What is E=mc^2? please explain..

Physics

1 answer:

Korvikt [17]3 years ago

7 0

Answer:

In physics, mass–energy equivalence is the principle that anything having mass has an equivalent amount of energy and vice ve

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49. A 6.1-kg bowling ball is liſted 2.1 m to a shell. Find

stealth61 [152]

Answer:

125.5J

Explanation:

Given parameters:

Mass of the bowling ball = 6.1kg

Height of lifting = 2.1m

Unknown:

Increase in the ball energy = ?

Solution:

The ball has changed position by moving it from one point to another. So, it has acquired more potential energy.

Potential energy = mgh

m is the mass

g is the gravity

h is the height

Now insert the given parameters and solve;

Potential energy = 6.1 x 9.8 x 2.1 = 125.5J

5 0

3 years ago

A piston–cylinder device with a set of stops initially contains 0.6 kg of steam at 1.0 MPa and 400°C. The location of the stops

Ilya [14]

Answer:

(a) Compression work at the final state with a pressure of 1(MPa) is: 44.32(KJ), (b) Compression work at the final state with a pressure of 500(KPa): 110.37(KJ) and (c) temperaure of the final state in part b: T=151.83(°C).

Explanation:

Remember that the substance is steam so it's water (H2O) and the initial conditions are $P_{1} =1MPa, T_{1}=400^{0}C, m=0.6Kg$ and $v_{2} =0.4v_{1}$ from a saturated water table and the initial conditions we can determine that the state phase is superheated (see Table 1 attached) because the $T_{sat}=179.88^{0} C \leq T_{1}$ from the table 1 we get: $v_{1} =0.30661(m^{3}/Kg)$ . Now we have second conditions as: $P_{2}=1(MPa), T_{2}=250^{0}C$ so from the same table we can see the state still superheated and we get $v_{2}=0.23275(m^{3}/Kg)$ , knowing that it's a isobaric process we can find the compression's work as: $W_{b}=m*P(v_{2}-v_{1})=0.6*1000*(0.23275-0.30661)=-44.32(KJ)$ so the compressor's work is: 44.32(KJ). (b) Then the piston reaches the stop and there are two processes in this stage, so Process 1 is isobaric and: $W_{1}=m*P*(v_{2}-v_{1}) =0.6*1000*(0.4*0.30661-0.30661)=-110.38(KJ)$ and the second process is isochoric: $W_{2}=zero$ ,now $W_{b}=W_{1}+ W_{2} =110.38+0=110.38(KJ)$ . Finally to get the temperarure at the final state in part (b) we get: $v_{2} =0.4v_{1} =0.4*0.30661=0.122644(m^{3}/Kg), P_{2}=500(KPa)$ from table 2 (see attached) we compare $v_{f}$ and $v_{g}$ at the saturated water table and find the following: $v_{f}=0.001093(m^{3}/Kg)$ , so we know that the final state phase is a satured mixture and we get the temperature at the final state as: $T_{2} =T_{sat} =151.83^{0}C$ .

3 0

4 years ago

As an airplane files, the airplane pushes against air. This resistance is called drag. What force does drag work against? A) ene

Anna [14]

Drag is opposing Thrust. Hope this Helps.

3 0

4 years ago

Read 2 more answers

The atomic mass is the number of ______+______ in an atom.

Juli2301 [7.4K]

Hello!

In chemistry, atomic mass is normally written in amu. This stands for atomic mass units.

Within an atom, there are three main parts: protons, neutrons, and electrons. Between these three, electrons are extremely light. However, protons and neutrons both weigh 1 amu.

Thus, this means to get the atomic mass, add together the protons + neutrons.

Hope this helps!

6 0

4 years ago

Read 2 more answers

Why do organisms need nitrogen

Yuri [45]

Plants and animals need nitrogen in order to make proteins. Proteins are essential compounds for healthy growth and fully functioning organisms.

4 0

4 years ago