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4 years ago

Water and cooking oil have the same density because they're both liquids. TRUE OR FALSE

Physics

2 answers:

ki77a [65]4 years ago

5 0

Answer:

False

Explanation:

Not all liquids have the same density. We know for example that oil float on the water surface because it has less density than the water.

marissa [1.9K]4 years ago

5 0

The given statement “Water and cooking oil have the same density because they're both liquids" is false.

Answer: Option 2

<u>Explanation: </u>

It’s not necessary to have same densities if two elements are in the same state of matter. Just like solids, liquids also have different level of densities.

If you add some vegetable oil in water, you’ll see that oil will float upon the surface of the water. In fact, different types of oils and liquids float in water according to their densities that are different from one another.

Liquids have different densities because of the atomic structure they have and their respective particles mass which forms their density being the ratio of their mass and volume. Thus, liquids or air having heavier density float lower than those having lighter density.

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A boy twirls a 15-lb bucket of water in a vertical circle. If the radius of curvature of the path is 4 ft, determine the minimum

chubhunter [2.5K]

Answer:

11.35 m/s

Explanation:

Given,

Weight of the bucket = 15 lb

radius of curvature, r = 4 ft

Minimum speed of the bucket = ?

Using equation of centripetal acceleration

$W=\dfrac{mv^2}{R}$

$15=\dfrac{\dfrac{m}{g}\times v^2}{4}$

$15=\dfrac{\dfrac{15}{32.2}\times v^2}{4}$

$v^2 = 128.8$

$v = 11.35\ m/s$

Speed of the bucket = 11.35 m/s

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3 years ago

A train starts from rest and accelerates uniformly until it has traveled 2.1 km and acquired a forward velocity of The train the

Andreas93 [3]

Answer:

4.4 km

Explanation:

t = Time taken

u = Initial velocity = 24 m/s (Assumed)

v = Final velocity

s = Displacement

a = Acceleration = -0.065 m/s² (Assumed)

Distance = Speed × Time

$\text{Distance}=24\times 400=9600\ m$

The train travels for 9600 m.

$v=u+at\\\Rightarrow 0=24-0.065t\\\Rightarrow t=\frac{-24}{-0.065}=369.23\ s$

$s=ut+\frac{1}{2}at^2\\\Rightarrow s=24\times 369.23+\frac{1}{2}\times -0.065\times 369.23^2\\\Rightarrow s=4430.76\ m$

The Distance the train traveled when it slowed down is 4.4 km

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4 years ago

Do transistors amplfy a.c or d.c<br>

Gnoma [55]

Explanation:

thet amplify DC, because of the voltage ( small current input signal)

5 0

3 years ago

Read 2 more answers

A 0.150 kg ball is fired from toy gun with a spring with spring constant k- 150 N/m, initially compressed by a distance x 0.050

Degger [83]

Answer:

v = 4.264 m/s

Explanation:

It is given that,

Mass of the ball, m = 0.15 kg

Spring constant of the spring, k = 150 N/m

The spring is compressed by a distance, x = 0.05 m

The pellet's initial velocity is at an angle θ (θ < 90) above the horizontal.

Let v is the final speed of the projectile when it is at a distance h = 0.800 m below its initial height. It can be calculated using the conservation of energy as :

$E_i=E_f$

$\dfrac{1}{2}kx^2+mgh=\dfrac{1}{2}mv^2$

$\dfrac{1}{2}\times 150\times (0.05)^2+0.15\times 9.8\times 0.8=\dfrac{1}{2}\times 0.15\times v^2$

v = 4.264 m/s

So, the final speed of the projectile is 4.264 m/s. Hence, this is the required solution.

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3 years ago

What happens to the light as it changes media from air to glass?

Dmitry [639]

Light is refracted when it crosses the interface from air into glass in which it moves more slowly. Since the light speed changes at the interface, the wavelength of the light must change, also. The wavelength decreases as the light enters the medium and the light wave changes direction.

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3 years ago