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Mars2501 [29]
3 years ago
14

Which situation shows potential energy transforming into kinetic energy 1.A car stopped at a stoplight 2.A flowerpot falling fro

m a balcony 3.A cow standing in a field 4.A bicycle slowing down
Physics
1 answer:
Troyanec [42]3 years ago
7 0

Answer:

2.A flowerpot falling from a balcony

Explanation:

Potential energy is the internal energy within a body at rest or at a height above the ground. In this case of the falling flowerpot, the flowerpot initially has a potential energy due to its position on the balcony above the surface of the earth. As the flowerpot falls, the work done against gravity in taking the flowerpot to this height on the balcony (equivalent to the potential energy) is transformed into the kinetic energy of motion as the flowerpot falls down through the height.

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7. Two liquid density 1100kg/m³ and 850kg/m³are mixed in equal volumes. The
ivolga24 [154]

Answer:

330 kg for high density liquid

255 kg for low density liquid

Explanation:

Density is defined as mass per unit volume hence expressed as p=m/v where p is density, m is mass and v is volume. Making m the subject of the formula then m=pv

The volume of the given container is given by lwh where l is length, w is width and h is height. Substituting 3m, 0.4 m and 0.5 m for l, w and h then volume is 3*0.4*0.5=0.6 cubic metres

Since the liquids are mixed equally, volume for each is 0.6/2=0.3 cubic metres

Mass of first liquid will be 1100*0.3=330 kgs

Mass for other liquid whose density is 850 kg/m3 will be 0.3*850= 255 Kgs

3 0
3 years ago
a crane convert 1000oule of energy in one second if it can do any work in one minute calculate the work done​
dedylja [7]

A 1000J or 1kJ of energy in 1 second implies that in 1 minute there will be 60kJ of energy converted.

Work is the defined as energy consumed thought time.

W=\dfrac{E}{t}

In our case,

W=\dfrac{60\mathrm{kJ}}{60\mathrm{s}}=1\cdot10^3\dfrac{\mathrm{J}}{\mathrm{s}}=\boxed{10^3\mathrm{W}}

Hope this helps!

8 0
4 years ago
20-kilogram canoe is floating downriver at 2 m/s. what’s the kinetic energy?
ziro4ka [17]

Answer:

40J

Explanation:

Kinetic energy = 1/2 mv^2

Where m = mass and

v = velocity

Given mass = 20kg

v = 2m/s

K.E = 1/2 x 20 x2^2

= 1/2 x 20 x 2 x 2

= 80/2

= 40J

6 0
3 years ago
Read 2 more answers
How long it take to change the velocity of a car from 100m/s to 250m/s if it accelerates at 5m/s^2​
Akimi4 [234]

Answer:

30 seconds

Explanation:

The formula for calculating acceleration is

( final velocity - inital velocity) ÷ time

If we enter the values, it would be (250 - 100) ÷ t = 5m/s^2

Now we need to know 't'

So we rearrange the equation to make t the subject.

(250-100) ÷ 5 = 30s

8 0
2 years ago
Find α, the angular acceleration of the wheel, which results from F⃗ pulling the string to the left. Use the standard convention
kap26 [50]

Answer:

α = F/(k×m×r)

Explanation:

When the wheel is pulled to turn in a counterclockwise direction, the wheel will have a moment of inertia given by Iw = k×m×r²

Where k = the radius of gyration of the wheel which is a dimensionless quantity less than one.

m = the mass of the wheel

r = the radius of the wheel

First and foremost, we relate the torque (τ) about the axle of the wheel to the force (F) applied on the wheel and we have that τ = r × F

We then relate the torque on the wheel to the angular acceleration (α), we have that τ = Iw × α, where Iw is the moment of inertia of the wheel as explained above

Substituting for torque τ and moment of inertia I into the above equation we have that

r × F = k×m×r² × α

solving for α we have that

α = r × F /(k×m×r²)

Therefore

α = F/(k×m×r)

8 0
4 years ago
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