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3 years ago

Urgent i need help with these questions

Physics

2 answers:

Anton [14]3 years ago

8 0

Answer:

Question 1: 25

Explanation:

i cant do the rest soz

Harrizon [31]3 years ago

4 0

Answer:

1. 25%

2. You can move the skater higher up to increase the potential energy.

3. The kinetic energy increases because there is more motion.

Explanation:

1. If the total kinetic and potential energy is 100%, and we know that the kinetic energy is 75%, then we can find the potential by finding the missing value of this equation. Potential energy + kinetic energy =total energy.

? + 75%=100%

2. The higher an object is, the more potential energy it has because of the increase of its gravitational energy.

3. When an object is higher, there is more potential energy. As the skater goes down, the potential energy decreases which in turn increases the kinetic energy.

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3 years ago

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What is the maximum frequency of visible light in hertz?

Nataliya [291]

All frequencies of light in hertz are in between
$Red = 4 * 10 ^{14} Hz$ and
$Violet = 8 * 10 ^{14} Hz$

Light with a lower frequency than 4 * 10^14 Hz, are called infrared and can't be seen by human eye. Light with a higher frequency than 8 * 10^14 Hz, are called ultraviolet and can't bee seen by human eye.

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4 years ago

A student of mass 63.4 kg, starting at rest, slides down a slide 21.2 m long, tilted at an angle of 26.1° with respect to thehor

Vera_Pavlovna [14]

Answer:

fr = 65.46 N , a = 8.74 m / s² and vf = 19.25 m / s

Explanation:

We write a reference system with an axis parallel to the slide and gold perpendicular axis, in this system we decompose the weight

sin 21.2 = Wx / W

cos21.2 = Wy / W

Wx = W sin21.2

Wy = W cos 21.2

We form Newton's equations

X axis

Wx -fr = m a

Y Axis

N- Wy = 0

N = Wy

fr = μ N

fr = μ (W cos 21.2)

fr = 0.113 63.4 9.8 cos 21.2

fr = 65.46 N

We replace and calculate the acceleration

W sin 21.2 - μ W cos 21.2 = m a

a = g (sin21.2 - μ cos 21.2)

a = 9.8 (without 21.2 - 0.113 cos 21.2)

a = 8.74 m / s²

This acceleration is along the slope of the slide, so we can calculate the distance

d = 21.2 m

vf² = v₀² + 2 a d

vf² = 0 + 2 a d

vf = √(2 8.74 21.2)

vf = √ (370,576)

vf = 19.25 m / s

3 0

3 years ago

Question 1 A ship's position is given as 0 degrees latitude and 27 degrees west longitude. We can conclude from this information

matrenka [14]

Answer: e. on the equator and in the Atlantic Ocean

Explanation:

Latitude and Longitude are geographical coordinates.

Latitude is the angular distance between the equatorial line, and a specific point on the Earth. It is measured in degrees and is represented according to the hemisphere in which the point is located, which can be north or south latitude.

In this sense latitude $0\°$ refers to the equatorial line that divides the Earth in two hemispheres (North and South).

On the other hand, Longitude represents the specific east–west position of a point on the Earth's surface, being longitude $0\°$ the prime meridian or Greenwich meridian.

So, if we have latitude $0\°$ and longitude $27\°$ (positive means it is to the East) we can already know the point is in the equator, and the option that bests describes the coordinates is e.

7 0

3 years ago