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3 years ago

Why does sound travel faster under water??

1 answer:

5 0

In water, the particles are much closer together, and they can quickly transmit vibration energy from one particle to the next. This means that the sound wave travels over four times faster than it would in air, but it takes a lot of energy to start the vibration.

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What do we mean when we describe forces as balanced?

aivan3 [116]

Well, first, let's recognize that there is no such thing as a force that is
balanced or unbalanced.

When we say that a group of two or more forces is balanced, we mean
that when you add up all the magnitudes and directions of the forces, the
whole group adds up to zero, so they have the same net effect as if there
were no force at all.

3 0

4 years ago

Ben and Jerry went for a drive. They decided to stop for a snack and have some ice cream. How fast did they drive on their way t

raketka [301]

Answer: B) 30 km/h

Explanation:

The speed of Ben and Jerry on their way to the store is given by

$v=\frac{d}{t}$

where

d is the distance they covered

t is the time they took

From the graph, we see that Ben and Jerry travelled for a distance of d=60 km in a time of t=2 h, so their speed is

$v=\frac{60 km}{2 h}=30 km/h$

5 0

3 years ago

Read 2 more answers

A 0.017-kg acorn falls from a position in an oak tree that is 18.5 meters above the ground.

Genrish500 [490]

Answer:

Velocity= 19.05 m/s

Kinetic energy= 3.08 J

Explanation:

The corn possess potential energy. Feom law of conservation of energy, all the potential eneegy will be converted to kinetic energy, with negligible friction.

Potential energy, PE= kinetic energy, KE

Potential energy is given by mgh while kinetic energy is given by $0.5mv^{2}$

Equating

$mgh=0.5mv^{2}$

Making v the subject of the formula then

$v=\sqrt {2gh}$

Substituting 9.81 m/s2 for g and 18.5 m for h then the velocity will be

$v=\sqrt {2\times 9.81\times 18.5}=19.0517715711689\ m/s\\v\approx 19.05\ m/s$

To get the kinetic eneegy, since PE=KE AND KE is

$KE=0.5mv^{2}$

Substituting v with 19.05 and m with 0.017 kg we have

$0.5\times 0.017\times 19.05^{2}=3.08467125/ J\approx 3.08 J$

This can also be achieved by mgh since PE=KE hence 0.17*9.81*18.5=3.085245 J and the results are slightly different due to small energy losses and rounding off of values.

7 0

3 years ago

What function does a generator perform inside a power plant?

serg [7]

The Generator transforms the mechanical energy of the turbine into electrical energy.

3 0

3 years ago

14. The ancient geographic setting of an area is known as its

kolezko [41]

I think the correct answer from the choices listed above is option C. The ancient geographic setting of an area is known as its paleogeography. Paleogeography is the study of historical geography and is generally used in studying physical landscapes. Hope this answers the question. Have a nice day.

6 0

4 years ago