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Nuetrik [128]
4 years ago
12

A powerboat, starting from rest maintains a constant acceleration. After a certain time Δt, its displacement and velocity are Δr

and Δv. At time 2Δt, what will be its displacement and velocity, assuming the acceleration remains constant?
(A) 2Δr and 2Δv
(B) 2Δr and 4Δv
(C) 4Δr and 2Δv
(D) 4Δr and 4Δv
Physics
1 answer:
Mazyrski [523]4 years ago
6 0

Answer:

The correct option is C) 4Δr and 2Δv

Explanation:

Initially from rest means , initial velocity and displacement is zero.

AT time t = Δt ,

Displacement ( s ) = Δr

velocity ( v) = Δv

Now At t = 2Δt

By using the equation of motion

v = u + at

s = ut + ( 1/2)at²

Here ,

v ∝ t   and s ∝ t²

Increasing times by two time velocity will increase twice and displacement by four times

Displacement = 4Δr

Velocity = 2Δv

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A parallel plate capacitor is charged up by a battery. The battery is then disconnected, but the charge remains on the plates. T
larisa [96]

Answer:

a. Decreases

b. Increases

c. Remains the same

d. Increases

Explanation:

a. Capacitance is given by c= Ak€/d

where A is conductivity plate with Area

K is a constant

€ is dielectric with permittivity.

d is the distance

b. Potential difference is given by

V = Ed, since, the electric field remains the

same, the potential diterence also increases with increase in distance.

Since the capacitance depends upon the distance, and all the other factors are kept constant, the capacitance decreases.

c. Electric field remains the same because charge on the

plate remains the same.

d. since electric field remains the same and capacitance decreases, the energy increases.

E= 1/2c * Q^2

7 0
4 years ago
Which is a transverse wave that requires a medium to move?
Ronch [10]
<span>the transverse wve that requires a medium to move is : sound waves in order to travel, sound waves need to jumped on between one particle to another, no matter it's liquid, solid , and gases. Which explains why you wont hear a thing in outer space, simply because the sound waves got no particle to jumped into</span>
4 0
4 years ago
What does not affect the gravitational potential energy of an object
natta225 [31]
Anything really like velocity? as long as its not mass, gravity, and height

Ep = mgh

Those are the only variables that affect potential energy
8 0
3 years ago
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Which of the following countries exclusively use the metric system? United States France England Canada
nadya68 [22]

The only three countries who do not use the metric system as their primary system of measurement are the United States, Liberia and Burma (Myanmar). Other countries have adopted the system but do not use it in all cases, for example road distances and speeds are still measured in miles and miles per hour in the United Kingdom.

5 0
4 years ago
Read 2 more answers
What is the net force (magnitude and direction) of the system below?
Crank

The net force (magnitude and direction) of the system given in the question is 40 N horizontal to the right

<h3>How to determine the net force</h3>

Case 1 (Net force between up and downward force)

  • Force up (Fu) = 50 N
  • Force down (Fd) = 30 N
  • Net force 1 (F1) = ?

F1 = Fu - Fd

F1 = 50 - 30

F1 = 20 N up

Case 2 (Net force between right and left)

  • Force right (Fr) = 60 N
  • Force left (Fl) = 20 N
  • Net force 2 (F2) = ?

F2 = Fr - Fl

F2 = 60 - 20

F2 = 40 N right

SUMMARY

  • Net force between up and down = 20 N up
  • Net force between right and left = 40 N right

From the above, the net force between right and left (i.e 40 N) is greater than the net force between up and down (i.e 20 N)

Thus, the net force of the system will be 40 N horizontal to the right

Learn more about force:

brainly.com/question/14361879

#SPJ1

4 0
2 years ago
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