answer.
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
shusha
3 months ago
13

The thrust of a certain boat’s engine generates a power of 10kW as the boat moves at constant speed 10ms through the water of a

lake. The magnitude of the drag force that is exerted on the boat’s hull as it is moving through the water is directly proportional to the boat's speed and is given by the equation F=kv. The increase in power needed for the boat to move through the lake at a constant speed of 12ms is : a. 0W b. 1440 W c. 4400 W 10,000 W e. 4,400 W
Physics
1 answer:
ValentinkaMS [3.4K]3 months ago
6 0

Answer:

The power increase is 4400 W.

Explanation:

Given data,

Power = 10 kW

Initial speed = 10 m/s

New speed = 12 m/s

The relevant equation is:

F=kv

It's known that,

The expression for power is,

P=Fv

Substituting the value of F into the formula gives

P=(kv)v

P=kv^2

P\propto v^2

Now we must determine the new power

By applying the power formula

\dfrac{P}{P'}=\dfrac{v^2}{v'^2}

Insert the value into the equation

\dfrac{10}{P'}=(\dfrac{10}{12})^2

P'=(\dfrac{12}{10})^2\times10

P'=14.4\ kW

Next, we calculate the change in power

Using the formula for power change

\Delta P=P'-P

Insert values into the equation

\Delta P=14.4-10

\Delta P=4.4\ kW

\Delta P=4.4\times1000

\Delta P=4400\ W

Thus, the change in power amounts to 4400 W.

You might be interested in
14 % 1 Question 8 of 42 An aeroplane's engines provide a force of 30,000N as it accelerates down the runway. The mass of the aer
ValentinkaMS [3465]

Given that,

Force F= 30,000 N

mass m= 4000 kg

acceleration =?

as F= ma

a= F/m

a= 30,000/4000

a= 7.5 m/s²

The acceleration of the aeroplane will, therefore, be 7.5 m/s².

8 0
2 months ago
A steel guitar string with a diameter of 0.300 mm and a length of 70.0 cm is stretched by 0.500 mm while being tuned. How much f
Softa [3030]

Answer:

The required force to stretch the steel guitar string by 0.500 mm is 10.1 N

Explanation:

The steel guitar string diameter is 0.300 mm and its length measures 70.0 cm. To calculate the force required for the specified elongation using Young's modulus, one would apply the relevant formulas, yielding 10.1 N.

8 0
2 months ago
A beam of light has a wavelength of 4.5 x10^-7 meter in a vacuum. the frequency of this light is
Ostrovityanka [3204]
The fundamental relationship between frequency and wavelength for light (as an electromagnetic wave) can be summarized as: f = c/λ, where c is the speed of light, f represents the frequency, and λ signifies the wavelength of the wave. By applying this formula, we can derive the frequency value.
3 0
1 month ago
A new class of objects can be created conveniently by ________; the new class (called the ________) starts with the characterist
ValentinkaMS [3465]

Answer:

Option A is the correct choice.

Inheritance, superclass, subclass

A new class of objects can be easily established through **inheritance**; the new class (termed the **superclass**) inherits the attributes of an existing class (referred to as the **subclass**), and can also modify them while including its own distinct features.

Explanation:

In object-oriented programming, a class is a concept that describes extensible program code utilized to define, name, and implement the desired functions of objects.

Inheritance refers to the formation of new classes derived from pre-existing ones. The core properties of the original classes are retained in the new classes formed from them.

Thus, new classes (generally enhancements of the original classes since they encompass the desirable attributes of the originals plus additional favorable traits or amendments) are identified as superclasses, while the older, pre-existing classes are classified as subclasses.

3 0
2 months ago
Other questions:
  • A snapshot of three racing cars is shown in the diagram. All three cars start the race at the same time, at the same place, and
    14·1 answer
  • Steel blocks A and B, which have equal masses, are at TA = 300 oC and T8 = 400 oC. Block C, with mc - 2mA, is at TC = 350 oC. Bl
    13·1 answer
  • A sonar device on a ship sends ultrasound waves under the water to locate a sunken ship. It takes the ultrasound wave 0.6 second
    15·1 answer
  • A motorist enters a freeway at 45 km/h and accelerates uniformly to 99 km/h. From the odometer in the car, the motorist knows th
    9·1 answer
  • An electric buzzer is activated, then sealed inside a glass chamber. When all of the air is pumped out of the chamber, how is th
    12·1 answer
  • At the end of the school day, at exactly 2:30 pm, a group of students run out of the school building and reach the edge of the s
    7·1 answer
  • A solid sphere is released from the top of a ramp that is at a height h1 = 2.30 m. It rolls down the ramp without slipping. The
    10·1 answer
  • Rotational dynamics about a fixed axis: A person pushes on a small doorknob with a force of 5.00 N perpendicular to the surface
    11·1 answer
  • One game at the amusement park has you push a puck up a long, frictionless ramp. You win a stuffed animal if the puck, at its hi
    6·1 answer
  • 500mL of He at 98 kPa expands to 750 mL. Find P2
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!