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3 years ago

7

A beam of light, incident on a flat water surface, reflects from the mirror-like surface so that the angle of incidence equals t

he angle of reflection. The water has waves. Would individual light beams obey the law of reflection in this case?

1 answer:

arsen [322]3 years ago

5 0

Answer:

a protractor

Explanation:

because protractors measure angles

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A supersonic airplane is flying horizontally at a speed of 2650 km/h. What is the centripetal acceleration of the airplane, if i

Andrew [12]

Answer:

$a_{c}=82617.65km/h^{2}\\ or\\a_{c}=6.37m/s^{2}$

Explanation:

Given data

Speed v=2650 km/h

Radius r=85.0 km

To find

Centripetal Acceleration

Solution

As centripetal acceleration is given as

$a_{c}=\frac{v^{2} }{r}................eq(i)$

where

v is velocity

r is the radius

Substitute the given values in eq(i)

$a_{c}=\frac{(2650km/h)^{2} }{85km} \\a_{c}=82617.65km/h^{2}\\ or\\a_{c}=6.37m/s^{2}$

5 0

3 years ago

An artificial satellite of mass 900kg Is launched at a speed of 11,000 m/s from its launching station. How much is the kinetic e

Marina CMI [18]

Answer:

KE = 54450 J

Explanation:

Data:

m = 900 kg
v = 11.000 m/s
KE = ?

Use the formula:

$\boxed{\bold{K_{E}=\frac{m*(v)^{2}}{2}}}$

Replace and solve:

$\boxed{\bold{K_{E}=\frac{900\ kg*(11.000\frac{m}{s})^{2}}{2}}}$

$\boxed{\bold{K_{E}=\frac{900\ kg*121\frac{m^{2}}{s^{2}}}{2}}}$

$\boxed{\bold{K_{E}=\frac{108900\ J}{2}}}$

$\boxed{\boxed{\bold{K_{E}=54450\ J}}}$

A kinetic energy of <u>54450 Newtons</u> is imparted to it.

Greetings.

6 0

3 years ago

Việt và Thái cùng nhảy ra khỏi một chiếc be với vận tốc bằng nhau

vitfil [10]

Answer:

k

Explanation:

8 0

3 years ago

Hour, a bicyclist travels 10 km north and then 6 km south. What is the average

liberstina [14]

Answer:

16km/hr

Explanation:

Total distance travelled= 10km+6km

Time taken= 1 hour

As we know that,

Velocity = distance/time

So,

Velocity= 16km/hr

8 0

4 years ago

In the Netherlands, there is an annual ice-skating race called the "Tour of the Eleven Towns." The total distar.rce of the cours

rjkz [21]

Answer:

a) The average speed of the record race is 35.2 km/h

b) The time it will take to cover the first half is 2h 42 min

Explanation:

a) The average speed of the record race is calculated dividing the total distance over time:

v = distance/ time

So let´s write the time in hours:

if 60 s is 1 min, then 37 s will be (37 s · 1 min/60 s) 0.62 min.

If 60 min is 1 h, then 40.62 min will be (40.62 min · 1 h/60 min) 0.68 h

Then, the record time is 5.68 h

The average speed will be:

v = 2.00 × 10² km / 5.68 h = 35.2 km/h

b) Now we have the speed and the distance and have to find the time it will take the skater to cover that distance:

The speed will be:

v = 1.05v = 1.05 · 35.2 km/h = 37.0 km/h

The distance will be:

2.00 × 10² km /2 = 1.00 × 10² km

Then:

v = distance/ time

time = distance /v = 1.00 × 10² km / 37.0 km/h = 2.70 h

If 1 h is 60 min, 0.70 h will be (0.70 h · 60 min/h) 42 min.

The time it will take to cover the first half is 2h 42 min

3 0

3 years ago