What is the key difference between mechanical and electromagnetic waves

A certain car traveling 33.0mph skids to a stop in 39m from the point where the brakes were applied. In approximately what dista

Greeley [361]

Answer: 156.02 metre.

Explanation:

Give that a certain car traveling 33.0mph skids to a stop in 39m from the point where the brakes were applied.

Let us use third equation of motion,

V^2 = U^2 + 2as

Since the car is decelerating, V = 0

And acceleration a will be negative.

U = 33 mph

S = 39 m

Substitute both into the formula

0 = 33^2 - 2 × a × 39

0 = 1089 - 78a

78a = 1089

a = 1089 / 78

a = 13.96 m/h^2

If we assume that the car decelerate at the same rate.

the distance the car will stop had it been going 66.0mph will be achieved by using the same formula

V^2 = U^2 + 2as

0 = 66^2 - 2 × 13.96 × S

4356 = 27.92S

S = 4356 / 27.92

S = 156.02 m

Therefore, the car would stop at

156.02 m

8 0

3 years ago

All of the following are concepts in psychophysics except __________.

pychu [463]

All of the following are concepts in psychophysics except introspection. The correct option among all the options that are given in the question is the last option. Psychophysics actually deals with the relationship between sensations, perceptions and the physical stimuli that effect. It is a complicated but an important subject that has unlimited boundaries.

5 0

4 years ago

Read 2 more answers

Magnetic field strength decreases as you get farther from the poles of the magnet. does the flux through the face of the coil ch

brilliants [131]

Magnetic field strength decreases as you get farther from the poles of the magnet.

<h3>Explanation</h3>

There are three ways to change the magnetic flux across a loop: Change the strength of the magnetic field across the surface (raise, reduce).

It doesn’t matter whether you move the coil while keeping the magnet fixed or the other way around if you want to change the surface area of the loop (raise by expanding the loop, decrease by reducing the loop).

The way they move in respect to one another determines how the magnetic flux across the coil changes. The direction in which the galvanometer needle deflects depends on which side of the coil confronts the magnet when you move it. The coil ends are labelled to show which goes to the red wire and which goes to the black wire.

To know more about magnetic flux visit:

brainly.com/question/16960581

#SPJ4

5 0

2 years ago

What equation illustrates the law of conservation of matter?

scoray [572]

<span>In a correctly balanced chemical equation, there are exactly the same number of atoms for each element found on both side of the equation (that is, in the reactants and the products).

No new atoms were made. None were destroyed. Matter was conserved.</span>

3 0

3 years ago

A boat travels 800 m east, then 200 m south, then 600 m at a direction of 50° south of west. 1) What is the distance from where

ELEN [110]

Answer:

1) The distance is 779 m.

2) The direction is 58° south of east.

Explanation:

1) To find the distance we have to sum the vectors and then find the magnitude of the resulting vector. Please, see the figure for a better understanding of the situation.

The y-component of the vector A is 0 (because it is directed horizontally relative to the origin of the frame of reference). Then, the vector A must be:

A = (800 m, 0)

The vector B has an x-component of 0, then the vector B will be:

B = (0, -200 m)

Notice that we consider the direction east and north as positive.

To find the components of the vector C we have to use trigonometry. Notice that the vector C is the hypotenuse of the right triangle formed by cx, cy, and C. Then, by trigonometry:

cos 50° = cx/C

C · cos 50° = cx

The magnitude of the x-component of the vector C is:

cx = 600 m · cos 50° = 386 m

In the same way for the y-component of C

sin 50° = cy/C

cy = 600 · sin 50° = 460 m

Then, the vector C will be: C = (-386 m, -460 m)

The resulting vector of the sum of each vector will be:

R = A + B + C = (800 m, 0) + (0, -200 m) + (-386 m, -460 m)

R = (800 m + 0 m - 386 m, 0 m -200 m - 460 m)

R = (414 m, -660 m)

The magnitude of the vector R will be:

R² = (414 m)² + (-660 m)²

R = 779 m

The distance from where the boat started to where it finished is 779 m.

2) To find the direction, we have to use trigonometry again. Please see the figure to notice that the x-component of R is 779 m · cos θ and the y-component is 779 m · sin θ (remember: cos θ = adjacent / hypotenuse and sin θ = opposite/hypotenuse).

Then:

414 m = 779 m · cos θ

cos θ = 414 m / 779 m

θ = 58°

Then, the direction of the resulting vector is 58° south of east

8 0

3 years ago