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2 years ago

Which correctly lists three places that fresh water is found?

Physics

2 answers:

marusya05 [52]2 years ago

8 0

Answer:

Explanation:

took on edg

AnnyKZ [126]2 years ago

6 0

Ice sheets water vapor rivers

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A solid, uniform disk of radius 0.250 m and mass 45.2 kg rolls down a ramp of length 5.40 m that makes an angle of 17.0° with th

serious [3.7K]

Explanation:

Given that,

Radius of the disk, r = 0.25 m

Mass, m = 45.2 kg

Length of the ramp, l = 5.4 m

Angle made by the ramp with horizontal, $\theta=17^{\circ}$

Solution,

As the disk starts from rest from the top of the ramp, the potential energy is equal to the sum of translational kinetic energy and the rotational kinetic energy or by using the law of conservation of energy as :

(a) $mgh=\dfrac{1}{2}mv^2+\dfrac{1}{2}I\omega^2$

h is the height of the ramp

$sin\theta=\dfrac{h}{5.4}$

$h=sin(17)\times 5.4=1.57\ m$

v is the speed of the disk's center

I is the moment of inertia of the disk,

$I=\dfrac{1}{2}mr^2$

$\omega=\dfrac{v}{r}$

$mgh=\dfrac{1}{2}mv^2+\dfrac{1}{2}\dfrac{1}{2}mr^2\times (\dfrac{v}{r})^2$

$gh=\dfrac{1}{2}v^2+\dfrac{1}{4}v^2$

$gh=\dfrac{3}{4}v^2$

$9.8\times 1.57=\dfrac{3}{4}v^2$

v = 4.52 m/s

(b) At the bottom of the ramp, the angular speed of the disk is given by :

$\omega=\dfrac{v}{r}$

$\omega=\dfrac{4.52}{0.25}$

$\omega=18.08\ rad/s$

Hence, this is the required solution.

4 0

3 years ago

How do the cities in the northern hemisphere compare to those in the southern hemisphere?

a_sh-v [17]

By the rate of the hemisphere

4 0

3 years ago

What is Newton's Third Law of Motion?

dedylja [7]

Newtons third law of motion is as below
every action has an equal and opposite reaction
#action=force
#reaction =another force

6 0

3 years ago

Read 2 more answers

Which is a property of every heterogeneous mixture?

Aneli [31]

D i am pretty sure :)

3 0

3 years ago

Read 2 more answers

Some radio waves have a frequency of 4.8 × 10^9 Hz. Wave speed of electromagnetic waves = 3.0 × 10^8 m/s. Calculate the waveleng

Verizon [17]

Answer : The wavelength of the radio waves is $6.2\times 10^{-2}m$

Explanation : Given,

Frequency = $4.8\times 10^9 Hz$

Wave speed = $3.0\times 10^8 m/s$

As we know that the speed of a wave is related to its frequency and wavelength.

Formula used:

$\nu =f\times \lambda$

where,

$\nu$ is the wave speed in metres per second, (m/s )

f is the frequency in hertz, (Hz )

$\lambda$ is the wavelength in metres, (m)

Now putting all the given values in the above formula, we get:

$3.0\times 10^8 m/s=(4.8\times 10^9 Hz)\times \lambda$

$\lambda=6.2\times 10^{-2}m$

Therefore, the wavelength of the radio waves is $6.2\times 10^{-2}m$

7 0

3 years ago