All categories

3 years ago

Hey can anyone help me wih these questions please

Physics

1 answer:

Pavel [41]3 years ago

4 0

The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in.An object will sink if it is more dense than the liquid it is placed in.

Since the above solid sinks to the bottom it reflects that the object is less dense that the water.

Hope this answers your question

You might be interested in

In order for water to condense on an object, the temperature of the object must be ______ the dewpoint temperature.

enyata [817]

Answer:

at ( or below)

Explanation:

at the dewpoint.......water will condense out of the air onto the surface

7 0

2 years ago

Which types of electromagnetic radiation can our senses detect?

GuDViN [60]

Our eyes can detect visible radiation, our skin can detect infra-red, our skin can also react to ultra-violet radiation by tanning, and producing skin cancers.

Our brains can react directly to the impact of gamma rays ( as "seen" by astronauts )
and some microwaves will cause us to heat up internally.


While radio waves and ELF waves seem to ignore us totally without the aid of aerials and amplifiers.

3 0

3 years ago

How would the speed of Earth's orbit around the sun change if Earth's distance from the sun

gayaneshka [121]

If Earth’s distance from the sun increased by 4 times then the speed of Earth’s orbit around the sun would decrease by a factor of 2.

Answer: Option 3

Explanation:

From Newton’s second law of motion, it is known that any kind of external force acting on an object will be equal to object’s mass and acceleration exerted on the object. So in this case, the gravitational force between Earth and Sun will be equal to the mass (M) and acceleration exerted on Earth.

$\text {Gravitational force}=\text {M} \times \text {Acceleration of Earth around the orbit}$

It is known that,

$\text {Acceleration in orbital motion}=\frac{\left(\text {velocity at which the Earth rotates)}^{2}\right.}{\text { Distance of Earth from the Sun}}$

Thus, substituting this, we get,

$\text {Gravitational force}=\frac{\text {M} \times\left(\text {velocity at which the Earth rotates)}^{2}\right.}{\text { Distance of Earth from the sun}}$

Also, we know,

$\text {Gravitational force}=\frac{G \times M \text { of sun } \times \text {M of Earth}}{(\text {Distance of Earth from the Sun})^{2}}$

Then, comparing both the equation, we get the orbital velocity as,

$\text { Orbital velocity } v=\sqrt{\frac{G \times M \text { of Sun }}{\text { Distance of Earth from the Sun }}}=\sqrt{\frac{G M}{r}}$

So, here G is gravitational constant, M is the mass of Sun and r is the distance of separation of Earth from Sun.

If the distance of Earth from Sun increases by 4 times so r’ will be 4r. Thus the new orbital velocity v’ will be

$v^{\prime}=\sqrt{\frac{G M}{r^{\prime}}}=\sqrt{\frac{G M}{4 r}}=\frac{1}{2} \sqrt{\frac{G M}{r}}$

So,

$v^{\prime}=\frac{1}{2} v$

Thus, the orbital speed will be decreased by a factor of 2 when the distance of Earth from the Sun increased by 4 times.

7 0

3 years ago

PLEASE HELP ME ASAP!!!!!!! giving brainliest for correct answers

Vera_Pavlovna [14]

Answer:

Explanation:

6 0

3 years ago

What is the current if a charge of 25 coulombs passes in 5 seconds?

Jobisdone [24]

Answer: 5 amps

Explanation: I = Q/t

8 0

3 years ago