If nothing is faster than light, how did the dark get there first?

Answers

Answer 1

Answer: say you were in a dark room and you turned on a flashlight ..the darkness was already there to begin with. the flashlight would fill the room with the speed of light.

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A source of wave produces 20 crest sand 20 troughs in 0.4 sec. Find the frequency of the wave.

Answers

1 whole wave is 1 crest and 1 trough.

20 crests and 20 troughs is 20 whole waves.

20 waves / 0.4 seconds = 50 waves per second.

Frequency = 50 Hz

What are the unit for acceleration

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$\longrightarrow$ The rate of change of velocity per unit time is called acceleration.

$\longrightarrow$ Its SI unit is m/s².

$\longrightarrow$ Formula of acceleration is v-u/t

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A person is rowing across the river with a velocity of 4.5 km/hr northward. The river is flowing eastward at 3.5 km/hr (Figure 4). What is the magnitude of her velocity ( v ) with respect to the shore?

Answers

The magnitude of her velocity with respect to the shore will be 5.70 Km/h. The change of displacement with respect to time is defined as velocity.

What is velocity?

Velocity is defined as the change in displacement with respect to time. The quantity of velocity is a vector quantity. It is a component that is time-based. It is measured in meters per second.

The given data in the problem is;

Q is the magnitude of Velocity of the boat = 4.5 km/hr

P is the magnitude of Velocity of the river flowing = 3.5 km/hr

R is the resultant of velocity P and Q=?

θ is the angle between the two velocities = 90°

From the law of vector addition;

$\rm R= √(P^2+Q^2+2PQcos\theta) \n\n \rm R= √((3.5)^2+(4.5)^2+2* 3.5 * 4.5 cos90^0) \n\n \rm R=5.70 \ m/sec$

Hence the magnitude of her velocity with respect to the shore will be 5.70 Km/h.

To learn more about the velocity refer to the link;

brainly.com/question/862972

Answer: The magnitude of her velocity ( v ) with respect to the shore is 5.70 km/h.

Explanation:

Magnitude of Velocity of the boat = Q

Magnitude of Velocity of the river flowing = P

R = Resultant velocity due to velocity of boat and velocity of river.

Applying Law of triangles of vector addition :

$R=√(P^2+Q^2+2PQCos\theta)$

From the figure attached:

P = 3.5 k/h, Q = 4.5 km/h

$\theta= 90^o$

$R=√(P^2+Q^2+2PQCos\theta)=√((3.5)^2+(4.5)^2+3.5* 4.5* cos90^o)=5.70$

$(Cos90^o=0),(sin 90^o=1)$

$\alpha =tan^(-1)(Qsin\theta)/(P+Qcos\theta)=tan^(-1)(4.5 sin 90^o)/(3.5+4.5 cos90^o)=tan^(-1)(4.5)/(3.5)=52.12^o$

The magnitude of her velocity ( v ) with respect to the shore is 5.70 km/h.

A straight horizontal line on a speed-time graph means the speedis constant. This means the speed is not changing over time.
How is this different from a distance-time graph?

Answers

Answer:

its devavtion is different from the distance changes process

Explanation:

Final answer:

A speed-time graph and a distance-time graph represent different aspects of motion. A horizontal line on the former indicates a constant speed (zero acceleration), while a straight, upward-diagonal line on the latter shows constant speed. A flat horizontal line on a distance-time graph shows no movement.

Explanation:

A speed-time graph and a distance-time graph each depict different aspects of motion. A horizontal line on a speed-time graph does indeed indicate constant speed or zero acceleration; the object is moving at a constant speed. However, a distance-time graph shows how the position of the object changes over time.

Let's take an example. If a car is traveling at a constant speed, on a speed-time graph, this would be represented by a horizontal line. The height of the line above the time axis represents the constant speed.

On a distance-time graph, a car moving at constant speed will be represented by a straight line with a positive slope. This is because the position of the car is continuously changing (it's covering distance), and at a constant rate. The slope of the distance-time graph gives us the speed of the car.

So, while a flat horizontal line in a speed-time graph indicates constant speed, a flat horizontal line in a distance-time graph would indicate no change in position, i.e., the object is not moving at all.

Learn more about Speed-Time vs Distance-Time Graphs here:

brainly.com/question/32824344

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A cube is measure 1 cm on each side and has a mass of 2 grams. Will it float on water?

Answers

Density = mass/volume
The density of water is 1g/cm^3

Density of the cube=2g/1cm^3
Density=2g/cm^3
Anything over the density of water will sink. The cube will not float.

A car is traveling at 20 m/s. It takes the car 120s to go from one intersection to a second. What was the displacement of the car between the two intersections?

Answers

We don't know if the road is perfectly straight between the intersections, or if the road bends, curves, or turns between them. So we don't have enough information to calculate the displacement between them.

But we can calculate the distance the car traveled between them.

Distance = (speed) (time)

Distance = (20 m/s) (120 s)

Distance = 2,400 meters

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