1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
igomit [66]
3 years ago
9

A car of mass 940.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 42.5 km/hr (11.8 m/s),

the net power which the engine supplies is 4300.0 W (in addition to the extra power required to make up for air resistance and friction). Calculate the acceleration of the car at that time.
Physics
2 answers:
madreJ [45]3 years ago
8 0

Answer: The acceleration of the car at that time is 0.39 m/s^2

Explanation:

Power (P) is given by

Power (P) = work done (W) / time (t)

But, work done (W) = force (F) × displacement (d)

Therefore,

Power (P) = (F × d) / t

But, velocity (V) is defined by

Velocity (V) = displacement (d) / time (t)

Hence,

Power (P) = Force (F) × Velocity (V)

P = F × V

Where P is power is Watts (W)

F is force is Newtons (N)

and V is velocity in meter / second (m/s)

To calculate the acceleration, we will first determine the Force, F

From the question,

P = 4300.0W

V = 11.8 m/s

Therefore,

4300.0 = F × 11.8

F = 4300.0 ÷ 11.8

F = 364.407N

From the formula,

F = m × a

Where m is the mass

a is the acceleration

and F is force

Acceleration is given by,

a = F / m

From the question,

m = 940.0 kg

Hence,

a = 364.407 / 940.0

a = 0.39 m/s^2

MAVERICK [17]3 years ago
4 0

Answer:

0.39 m/s^2

Explanation:

Parameters given:

Mass of car, m = 940 kg

Speed of car, v = 11.8 m/s

Power supplied by engine, P = 4300 W

To get the acceleration, we must define the relationship between Power and velocity.

Power, P, is given in terms of velocity, v, as:

P = F * v

where F = force

This is because Power is given as:

P = \frac{E}{t} \\\\\\P = \frac{F*d}{t} \\\\\\=> P = F * v

(where E = energy. t = time taken, d = distance moved)

Force, F, is given as:

F = m*a

Therefore, Power will be:

P = m * a * v

Acceleration, a, will then be:

a = \frac{P}{m*v}

a = \frac{4300}{940 * 118} \\\\\\a = 0.39 m/s^2

The acceleration of the car at that time is 0.39 m/s^2

You might be interested in
A ball is thrown upward at a 45° angle. Inthe absence of air resistance, the ballfollows aA. tangential curve.B. sine curve.C. p
Evgesh-ka [11]

As ball is projected up in air at an angle of 45 degree without any air resistance

Let the initial speed will be v

now we will have

In x direction

v_x = v cos45

in y direction

v_y = vsin45

now displacement in x direction

x = (vcos45)t + 0

displacement in y direction

y = (vsin45)t - \frac{1}{2}gt^2

now from above two equations we have

y = (vsin45)\frac{x}{vcos45} - \frac{1}{2}g(\frac{x}{vcos45})^2

y = xtan45 - \frac{1}{2v^2cos^245}gx^2

so above equation is a quadratic equation and hence it will be a parabolic curve

so correct answer will be

<em>C. parabolic curve.</em>

8 0
3 years ago
What is the current when the resistance is 5 ohms and the voltage is 10 volts?
Travka [436]
Ohm's Law states V = IR
So,
I = V/R
The answer is B. 10/5=2 amps
5 0
3 years ago
Read 2 more answers
How do you convert Kg's to Newtons?
MA_775_DIABLO [31]
You don't convert kilograms to newtons.  By the time you've heard of these units, you know that 'kilogram' is a unit of mass, 'newton' is a unit of force or weight, and that mass and weight are different things.

Mass and force are <u>related</u> by Newton's second law: 

                       Force = Mass x acceleration .

From this simple formula, you can see that in order to relate a mass to a force, you need to know an acceleration.  And if the acceleration changes, then the relationship between the force and the mass also changes.  So there's no direct conversion.

ON EARTH ONLY, one kilogram of mass <em>weighs</em> 9.8 newtons. The acceleration that connects them is the acceleration of gravity on Earth.  In other places, with different gravitational accelerations, 1 kilogram weighs more or less newtons.

But they don't convert directly.  That would be like asking "How do you convert miles to miles-per-hour ?" 
5 0
3 years ago
What causes a wave to begin
kakasveta [241]
Wind or gravitational pull. A wave is made by friction between wind and the water’s surface. Waves can also be made by the sun and moon’s gravitational pull on the earth.
5 0
3 years ago
What happens when a negatively charged object A is brought near a neutral object B?
castortr0y [4]

Answer: Option B

Explanation : When a negatively charged object A gets in contact with the neutral object B, the negative charge of object will induce the opposite charges on object B. Hence, there will be a positive charge on object B

8 0
3 years ago
Other questions:
  • A scientist wants to test ways to reduce pollution in lake . What is the bestway of doing this
    13·2 answers
  • According to roosevelt, what are the for freedom to which every one in the world is entitle?
    11·1 answer
  • Tightness of the sciatic nerve can result in lower back pain true or false
    6·1 answer
  • A man is pushing a heavy crate up an inclined plane (ramp) into the back of semi trailer. What can the man do to make it easier
    13·2 answers
  • if a source of sound waves is rabidly approaching a person the sound heard by the person appears to have?
    14·2 answers
  • A device that uses the wet/dry bulb method to measure the ___________________is the sling psychrometer. As seen here, two thermo
    5·1 answer
  • If a vehicle is traveling at constant velocity and then comes to a sudden stop, has it undergone negative acceleration or positi
    6·1 answer
  • A Or b <br> Question in picture
    6·2 answers
  • The wind blows a lawn chair that weighs 4 kg into a fence with a force of 8 N. How much reaction force does the fence exert on t
    10·1 answer
  • 3) Principles of rectilinear proportion of light 9​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!