3 years ago

Why do your legs appear shorter when standing in water

1 answer:

8 0

It is because of refraction caused in water. There is difference in the medium between water and air so because of that refraction takes place. Due to this, a person’s legs appear to be shorter to our eyes. Hope this helps!

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two cars are travelling side by side down a straight road in opposite directions. both cars are travelling at a speed of 22 m/s.

Nimfa-mama [501]

Answer: 44m/s

Explanation:

Speed of Car A travelling left = 22m/s

Speed of Car B travelling right = 22m/s

Now recall that relative speed of objects moving in opposite directions is equal to the sum of each speed

Hence, Relative speed = (Speed of Car A + Speed of Car B)

= (22m/s + 22m/s)

= 44m/s

3 0

3 years ago

The angular speed of a rotating platform changes from

Leviafan [203]

Answer:

Explanation:

The angular speed of a rotating platform changes from.at a constant rate as the platform moves through an angle

3 0

3 years ago

a lamp rated 100w 220 v is connected to mains electric supply . what current is drawn from the supplyy line, if the voltage is 2

melomori [17]

Power = (voltage) x (current)

100w = 220v x current

Current = 100w / 220v = <u>0.455 Ampere</u> (rounded)

5 0

3 years ago

A spring with a spring constant of 1200 N/m has a 55-g ball at its end. The energy of the system is 5.5J. What is the amplitude

Pepsi [2]

The energy of the system is E=5.5 J. This energy is the same at every moment of the oscillation. When the stretch x of the spring is maximum (so, when the stretch is equal to the amplitude: x=A) the velocity of the spring is zero, so all this energy is just elastic potential energy of the spring:
$E= \frac{1}{2}kA^2$
From which we find
$A= \sqrt{ \frac{2E}{k} }= \sqrt{ \frac{2 \cdot 5.5 J}{1200 N/m} }=0.096 m$

4 0

3 years ago

After our sun leaves the main sequence it will most likely

meriva

Our Sun will probably become a red giant before collapsing into a dwarf star.

7 0

3 years ago