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Stolb23 [73]
3 years ago
13

Look at the picture below. The boy is swinging back and forth on the swing. At which point is the potential energy of a swing th

e greatest?
Point A (top)


Point B (halfway down)


Point C (bottom)


Point D (halfway up)
Physics
2 answers:
Komok [63]3 years ago
5 0
The correct answer is Point A the top
kvv77 [185]3 years ago
3 0

Point A (top)

Potential energy is the energy possessed by an object due to its height relative to a reference level. so greater the height above the reference level, greater will be the potential energy.

when the boy is at the top, the height is maximum there. hence the potential energy of the boy is maximum at the Top.

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You are riding in the passenger seat of a car as it goes around a tight turn. You slide across the seat to the passenger side do
DochEvi [55]

Answer:

1. b. The door is exerting a centripetal force on you that balances the centrifugal force of the turn.

2. b. There is no net force acting on the object.

Explanation:

1. This is because as you move to the right due to the centrifugal force of the turn, a corresponding centripetal force acts on you due to the door which does not allow you fall out of the car since,<u> the door is exerting a centripetal force on you that balances the centrifugal force of the turn. </u>

So, the answer is b

2. This is because, since the object moves at a constant speed and thus does not accelerate, no net force can act on it since, a net force would imply that the object accelerates. Note that a constant speed does not imply that no force acts on it. It only shows that the resultant or net force is zero since the object does not accelerate.

So, <u>there is no net force acting on the object. </u>

So, b is the answer.

6 0
2 years ago
Jackie rides her bike to school every day and enjoys playing beach volleyball on weekends. She also helps with tasks around the
Alinara [238K]

Answer:

The correct answer is - C) Jackie may maintain healthy body fat levels.

Explanation:

Jackie has a very active daily and on weekends routine that includes riding the bike, playing volleyball, pushing weeds, and sweeping the porch. The activities that Jackie is performing daily as well as the time that she spends on exercise may help her to maintain body fat levels.

Being physically active helps in maintaining fat levels in the body of an individual, and it is healthy for the individual.

Thus, the correct answer is - C) Jackie may maintain healthy body fat levels.

6 0
3 years ago
How much heat is released when 30 g of water at 96°C cools to 25°C?The specific heat of water is 1 cal/gºC.
Blababa [14]
2130 cal is how much is released qhen 30 g of water at
3 0
3 years ago
Read 2 more answers
Which of the following objects has kinetic energy?
kotykmax [81]

Answer:

B

Explanation:

A body has kinetic energy that is moving

5 0
2 years ago
Read 2 more answers
A. What is the equation describing the motion of a mass on the end of a spring which is stretched 8.8cm from equilibrium and the
Naddik [55]

Answer:

a) x = 8.8 cm * cos (9.52 rad/s * t)

b) x = 8.45 cm

Explanation:

This is a Simple Harmonic Motion, and most Simple Harmonic Motion equations start from the equilibrium point. In this question however, we are starting from the max displacement the equations, and thus, it ought to be different.

From the question, we are given that

A = 8.8 cm = 0.088 m

t = 0.66 s

Now, we need to find the angular speed w, such that

w = 2π/T

w = (2 * 3.142) / 0.66

w = 6.284 / 0.66

w = 9.52 rad/s

The displacement equation of Simple Harmonic Motion is usually given as

x = A*sin(w*t)

But then, the equation starts from the equilibrium point at 0 sec, i.e x = 0 m

When you have to start from the max displacement, then the equation would be

x = A*cos(w*t).

So when t = 0 the cos(0) = 1, and then x = A which is max displacement.

Thus, the equation is

x = 8.8 cm * cos (9.52 rad/s * t)

At t = 1.7 s,

x = 8.8 cos (9.52 * 1.7)

x = 8.8 cos (16.184)

x = -8.45 cm

5 0
3 years ago
Read 2 more answers
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