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BlackZzzverrR [31]
3 years ago
12

A boy 1m tall looks at the swimming pool, which appears to be 75 cm deep, according to the people around him. He finds himself a

lmost completely submerged in water when he steps into the water. Was he tricked? How did it happen?
Physics
1 answer:
Leto [7]3 years ago
4 0
When you look vertically downwards into a swimming pool full of water the bottom of the pool seems closer to you than it really is. The apparent depth at this point can be worked out using the formula:

Apparent depth = Real depth/Refractive index of water

However as you look towards the end of the pool the bottom seems to curve upwards – we are thinking about a pool of constant depth to start with.


If the depth of the pool really does change then the situation becomes more complex and you would need to allow for that when drawing the diagram
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Suppose there is a uniform magnetic field, B, pointing into the page (so your index finger will point into the page). If the vel
Naily [24]

Answer:

Explanation:

We shall show all given data in vector form and calculate the direction of force with the help of following formula

force F = q ( v x B )

q is charge , v is velocity and B is magnetic field.

Given B = - Bk ( i is  right  , j is  upwards  and k is straight up the page  )

v = v j

F = q ( vj x - Bk )

= -Bqvi

The direction is towards left .

a ) If velocity is down

v = - v j

F = q ( - vj x - bk )

= qvB i

Direction is right .

b ) v = v i

F = q ( vi x - Bk )

= qvB j

force is upwards

c ) v = - vi

F = q ( -vi x - Bk )

= -qvBj

force is downwards

d ) v = - v k

F = q( - vk x -Bk  )

= 0

No force will be created

e ) v =  v k

F = q(  vk x -Bk  )

= 0

No force will be created  

3 0
3 years ago
Please help I'll mark brainliest NO LINKS
Bond [772]

Answer:C

Explanation:

7 0
3 years ago
A wheel has a radius of 9 centimeters and an axle radius of 3 centimeters. The IMA of the system is ___?
otez555 [7]

Answer:

Answer is C.

Explanation:

To calculate the IMA for a wheel and axle, find the ratio of the larger radius to the smaller radius:

IMA = R/r

IMA = 9/3

IMA = 3

4 0
4 years ago
Estimate the volume of each ball. Use the formula
Mila [183]

The given question is incomplete. The complete question is:

Estimate the volume of each ball. Use the formula v=\frac{4\pi\times r^3}{3} where v is the volume and r is the radius. record the volume in table A of your student guide. The radius of the tennis ball is 2.1 cm and the radius of thr golf ball is 2.0 cm. What is the estimated volume of the table tennis ball in cm^3
 What is the estimated volume of the golf ball in

Answer: Volume of the tennis ball is 38.8cm^3 and  Volume of the golf ball is 33.5cm^3

Explanation:

We have to find the Volume of tennis ball and golf ball by using the formula v=\frac{4\pi\times r^3}{3}

Radius of the tennis ball = 2.1 cm

Radius  of the golf ball =2.0 cm.

Putting the value of radius in the formula , we get:

Volume of the tennis ball =  \frac{4\times 3.14\times (2.1cm)^3}{3}
=38.8cm^3

Volume of the golf ball =   \frac{4\times 3.14\times (2.0cm)^3}{3}
=33.5cm^3

Volume of the tennis ball is 38.8cm^3 and  Volume of the golf ball is 33.5cm^3

6 0
3 years ago
Read 2 more answers
Which of the following is equivalent to 140 centiliters?
stiks02 [169]
<span>The answer 0.00140 kiloliters 
</span><span>ecause one litre=100 centiliters, and one kilolitre=one litre which means that one kilolitre =100000 centiliters So 140 centiliters are 140 divided by 100000 kiloliters=0.00140 kiloliters</span>
7 0
3 years ago
Read 2 more answers
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