Electromagnetic waves can travel through empty space true or false

Answers

Answer 1

Answer: False. Heat radiation from the sun cannot reach Earth, we cannot receive TV or GPS signals from satellites, and we cannot detect the light from distant stars.
Oh, wait . . .

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If gravity did not affect the path of a horizontally thrown ball, the ball would ____.

Answers

If net force acting on the ball is zero(here if no gravitational force acts on the body), the ball will continue its motion in the same direction. Hope this helps.

Answer:

travel Horizontally

Explanation:

Why do we insulate houses?A. To prevent heat transfer from inside to
the outside
B. To allow energy to flow from inside to
the outside
C. To keep them cool in the winter and
warm in the summer

Answers

B to allow energy to flow from inside to the outside

As parallel resistors are added, circuit resistance decreases.
a. True
b. False

Answers

As parallel resistors are added, circuit resistance decreases. This is TRUE.

This figure shows the angular displacement of a pendulum on a planet with five times the earth's gravity. How long is the pendulum's string?1.0 m

3.2 m

0.80 m

4.0 m

Answers

Answer:

$L = 1.24\ m$

Explanation:

It is known that the oscillation period of a pendulum can be described as

$T=2\pi \sqrt((L)/(g))\n$ ,

where T is the oscillation period, L is the length of the pendulum and, g is the gravity.

Solving For the length we get:

$L=g( (T)/(2\pi))^(2)$ .

We know that g equals 5 times earth's gravity,

$g=5*9.8=49\ m/s^(2)$ ,

and from the angular displacement graphics, it can be seen that the period is

$T= 1\ s$ .

Now, we can easily compute the length of the pendulum:

$L=g((T)/(2\pi))^(2)\n\nL=49((1)/(2\pi))^(2)\n\n\n\nL=1.24\ m\n$

Explanation:

The period (time per cycle) is 1.0 s. The gravity is 5g or 49 m/s². Therefore:

T = 2π √(L / g)

1.0 s = 2π √(L / 49 m/s²)

L = 1.2 m

A car that travels from point A to point B in four hours, and then from point B back to point A in six hours. The road between point A and point B is perfectly straight, and the distance between the two points is 240 km. What is the car’s average velocity?

Answers

Note : Be careful with speed and velocity, even the formula is same that $v = (x)/(t)$

1. If we would like to find the velocity, we must calculate the distance from initial to final, $x_(f) - x_(i) = (delta)x$ ,

2. If we would like to find the speed, we must calculate the total distance that travelled ( $x_(total)$ .

So, in this question, because it return back to its initial point so (delta)x = 0, so average velocity is 0 m/s.

If you mean average speed, it is 480/10 = 48 kn/h

If you mean average velocity, it is 0/10 = 0 km/h

How is the horizontal component of velocity for a projectile affected by the vertical component?

Answers

It isn't. The horizontal and vertical velocities are separate. You separate that velocity into the horizontal component which is constant, disregarding air resistance, and vertical velocity which is changed by the acceleration due to gravity. Make calculations separately because they do not influence each other.

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