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3 years ago

Which of the following is not examples of centripetal acceleration? Check all that apply.

Physics

2 answers:

Andre45 [30]3 years ago

7 0

Answer:

B.A dart headed for a dart board

C.A dart headed for a dart board

D.A golf ball rolling down the green

Explanation:

for centripetal acceleration a body should direct towards the center of the circle or inward the circular path while moving with magnitude square of its velocity. the dart headed for a dart board is not moving along a curved path so it can not attain centripetal acceleration same as goes for a golf ball as it is also not moving around a circular path.

rodikova [14]3 years ago

6 0

Dart headed for dart board

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A 72-kg boy is surfing and catches a wave which gives him an initial speed of 1.6 m/s. He then drops through a height of 1.61 m,

chubhunter [2.5K]

Answer:

2849.98 J

Explanation:

From the question,

Work done by the boy = change Potential energy of the boy + change in kinetic energy of the boy

W = ΔP + ΔK..................... Equation 1

Where W = work done by the boy, ΔP = change in potential energy of the boy, ΔK = Change in kinetic energy of the boy.

But,

ΔP = mgΔh.................... Equation 2

ΔK = 1/2mΔv²................. Equation 3

Where m = mass of the boy, Δh = change in height of the boy, Δv = change in velocity of the boy.

Substitute equation 2 and 3 into equation 1

W = mgΔh+1/2mΔv²................. Equation 4

Given: m = 72 kg, Δh = 1.61 m, Δv = 8.5-1.6 = 6.9 m/s, g = 9.8 m/s²

Substitute into equation 4

W = 72(9.8)(1.61)+1/2(72)(6.9²)

W = 1136.016+1713.96

W = 2849.98 J

8 0

3 years ago

Explian the construction of electric motor?

Nataly_w [17]

Answer:

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3 years ago

A car is driving down the highway at a 50 m/s. Suddenly, the driver sees an accident and slams on his breaks, coming to a comple

vlada-n [284]

Given parameters:

Speed of the car = 50m/s

Time = 10s

Unknown:

Distance traveled before the car stopped = ?

We need to establish speed - time - distance relationship.

Speed is the rate of change of distance with time. It is a scalar quantity .

Mathematically;

Speed = $\frac{distance}{time}$

Distance = speed x time

Input the parameters and solve;

Distance = 50 x 10 = 500m

The car traveled 500m before it stopped.

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2 years ago

A battery is connected to a light bulb in a circuit. There is a current of 2 A in the light bulb.

Georgia [21]

Answer:

Resistance of the light bulb = 1.33 ohm (Approx.)

Explanation:

Given:

Current in electric bulb = 2 Amp

Voltage in battery = 1.5 Volt

Find:

Resistance of the light bulb

Computation:

Resistance = Voltage / Current

Resistance of the light bulb = Voltage in battery / Current in electric bulb

Resistance of the light bulb = 2 / 1.5

Resistance of the light bulb = 1.33 ohm (Approx.)

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2 years ago

Explain thermodynamics?

Maurinko [17]

Explanation:

the branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy

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3 years ago

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