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3 years ago

Forces contribute to the net force on a car rolling down a ramp?

Physics

2 answers:

dlinn [17]3 years ago

8 0

<u>Answers</u>

1) Reaction

2) Gravitational force

3) Frictional force

<u>Explanation</u>

Reaction is directly opposite and equal to action(normal force). The normal force is the weight. So we can say that reaction supports the weight of the car.

Objects fall downwards due to acceleration due to gravity. The acceleration force is provided by the gravitational force. The car is accelerated downwards by the gravitational force.

Frictional force is the force that opposes relative motion between two bodies. When iar is involved, we call it viscosity. So the force that acts against the motion of the car is friction.

nordsb [41]3 years ago

5 0

A. the normal force is the ground pushing up on the car
b. gravity accelerates the car down toward the earth
c. friction and air resistance act against the motion

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Can an objects displacement be greater than or equal to the objects distance?

Reptile [31]

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4 years ago

A circular coil of radius 5.0 cm and resistance 0.20 Ω is placed in a uniform magnetic field perpendicular to the plane of the c

DedPeter [7]

Answer:

The induced current in the coil at the time 2 s is 0.00263 A

Explanation:

The equation for induced emf is equal to:

$\epsilon =-\frac{d}{dt} (BAcos\theta )$

Where

B = magnetic field

A = area

θ = angle

$\epsilon =-Acos0\frac{d}{dt} B\\\epsilon =-(\pi r^{2} )\frac{d}{dt} (0.5e^{-0.2t} )\\\epsilon =0.1 (\pi r^{2} )e^{-0.2t}$

For t = 2 s

$\epsilon =0.1*\pi *0.05^{2} *e^{-0.2*2} =5.26x10^{-4} V$

The induced current is:

$I=\frac{\epsilo }{R} =\frac{5.26x10^{-4} }{0.2} =0.00263A$

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3 years ago

When red light and green light shine on the same place on a piece of white paper, the spot appears t obe?

katen-ka-za [31]

When red light and green lights shine on the same place on a piece of white paper, the spot appears to be Yellow in color. Complementary colors are always located directly across from each other on the graphic. For example cyan is located across from red, magenta across from green, and yellow across from blue. When primary color mix the produce secondary colors , for example a red light and a green light will combine to form a yellow color. The production of various colors of light by the mixing of the three primary colors of light is known as color addition.

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4 years ago

Read 2 more answers

A 3.80-m-long, 500 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building

Virty [35]

Answer:

Explanation:

The question is ;

3.80 m-long, 500. kg steel beam extends horizontally from the point

where it has been bolted to the framework of a new building under

construction. A 67.0 kg construction worker stands at the far end of

the beam. What is the magnitude of the torque about the point where the beam is bolted into place?

Solution:

Here two torques are in action

a) torque T1 due to weight of worker at the edge of the beam - at center of the beam

b) torque T2 due to weight of the uniform beam - at the point where the beam is bolted

So we first calculate the torque produced due to weight of the worker;

We can see that;

Distance of worker from the center of the beam = 1.9m

Mass of the worker = 67 kg

Value of g= 9.8 m/sec2

T1=force × distance from point of rotation

Here force is weight of the worker which is = mass × g=67×9.8=656.6 N

So the torque is

T1= 656.6×1.9=12225.892 Nm

T1 = 12225.892 Nm

Now torque by the beam itself ;

Length of the beam from its center point to the bolt point = 1.9 m

Weight force of beam acting at center point= mass× g= 500×9.8=4900 N

Torque T2 at bolt point by the beam weight = weight of beam × length of beam from its center to the bolt point = 4900×1.9=9310 Nm

T2=9310Nm

So total torque = T1+T2= 12225.892+9310=21565.892 Nm

8 0

3 years ago

A hair dryer draws 11 A when it is connected to 120 V. If electrical energy costs $ 0.09/kW·h, what is the cost of using the hai

Papessa [141]

Answer:

The cost of using the hair dryer for 15 minutes is $\$3.6\bar 6$

Explanation:

The parameters given in the question are;

The electric current drawn by the the air dryer, I = 11 A

The voltage to which the hair dryer is connected, V = 120 V

The duration of usage of the hair dryer = 15 minutes = 60 minutes /4 = 1 hour/4 = 0.25 hour

The electrical energy costs $0.09/kW·h

The power consumed by the hair dryer = I × V = 11 × 120 = 1320 Watts = 1.32 kW

The energy used by the hair dryer in 15 minutes (0.25 hour) = 1.32 × 0.25 0.33 kW·h

The energy used by the hair dryer in 15 minutes (0.25 hour) = 0.33 kW·h

The energy cost = $0.09/(kW·h)

Therefore;

The cost of using the hair dryer for 15 minutes (0.25 hour) = 0.33 kW·h/($0.09/(kW·h)) = $33/9 = $3 2/3 = $3.6 $\bar 6$ .

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3 years ago