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stira [4]
3 years ago
15

An object travels for 5 minutes with constant motion. What conclusion can you make about the sum of the forces (total force) act

ing upon an object? How did you reach this conclusion?
Physics
1 answer:
zheka24 [161]3 years ago
3 0
Using Fnet= ma, constant motion means 0 acceleration, Fnet ( force ) will be also 0
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Which nucleus completes the following equation?
asambeis [7]

Answer:

D.

Explanation:

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3 years ago
How much heat is required to convert 2.55g of water at 28 degrees c to steam?
pantera1 [17]
There are two different processes here:
1) we must add heat in order to bring the temperature of the water from 28^{\circ}C to 100^{\circ}C (the temperature at which the water evaporates)
2) other heat must be added to make the water evaporates

1) The heat needed for process 1) is
Q_1=m C_s \Delta T
where 
m=2.55 g is the water mass
C_s = 4.18 g/J^{\circ}C is the water specific heat
\Delta T=100^{\circ}C-28^{\circ}C=72^{\circ}C is the variation of temperature of the water
If we plug the numbers into the equation, we find
Q_1 = (2.55 g)(4.18 J/g^{\circ}C)(72^{\circ}C)=767.4 J

2) The heat needed for process 2) is
Q=m L_e
where 
m=2.55 g is the water mass
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If we plug the numbers into the equation, we find
Q_2=(2.55 g)(2264.7 J/g)=5775.0 J

So, the total heat needed for the whole process is
Q=Q_1+Q_2=767.4 J+5775.0 J=6542.4 J
4 0
3 years ago
What happens when a wave encounters a boundary and then goes back to the original medium?
lawyer [7]
It causes a movement of convection in the water resulting in a pulling current.

Hope this helpss
7 0
3 years ago
Velocity of sound increases on a cloudy day. Why?
Nat2105 [25]
The density of air reduces as humidity and amount of water in the air increases. <span> The speed of sound is inversely proportional to the root of density, therefore sound travels faster on a cloudy day than on a dry day so, velocity of sound increase.</span>
8 0
3 years ago
Read 2 more answers
A thin, horizontal rod with length l and mass M pivots about a vertical axis at one end. A force with constant magnitude F is ap
katen-ka-za [31]

Answer:

The magnitude of the angular acceleration is α = (3 * F)/(M * L)

Explanation:

using the equation of torque to the bar on the pivot, we have to:

τ = I * α, where

I = moment of inertia

α = angular acceleration

τ = torque

The moment of inertia is equal to:

I = (M * L^2)/3

Also torque is equal to:

τ = F * L

Replacing:

I * α = F * L

α = (F * L)/I = (F * L)/((M * L^2)/3) = (3 * F)/(M * L)

8 0
3 years ago
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