Ask question

Ask question

All categories

3 years ago

7

Suppose you heat a liquid and then bubbles are produced. With no other evidence, can you tell whether a physical or chemical is

occurring? Explain your answer

1 answer:

pogonyaev3 years ago

4 0

Chemical cause when you heat liquid it turns into water vapor

You might be interested in

A particle moves along the x axis so that its velocity at time t is given by v(t)=

vodomira [7]

Answer:

a = 0.7267 , acceleration is positive therefore the speed is increasing

Explanation:

The definition of acceleration is

a = dv / dt

they give us the function of speed

v = - (t-1) sin (t² / 2)

a = - sin (t²/2) - (t-1) cos (t²/2) 2t / 2

a = - sin (t²/2) - t (t-1) cos (t²/2)

the acceleration for t = 4 s

a = - sin (4²/2) - 4 (4-1) cos (4²/2)

a = -sin 8 - 12 cos 8

remember that the angles are in radians

a = 0.7267

the problem does not indicate the units, but to be correct they must be m/s²

We see that the acceleration is positive therefore the speed is increasing

6 0

3 years ago

What would the circuit resistance be if a 7.5 Amp draw was present with the engine running and the charging system producing 15

AlladinOne [14]

Answer:

2 ohms

Explanation:

Hi there!

Ohm's law states that $V=IR$ where V is the voltage, I is the current and R is the resistance.

Plug in the given information (I=7.5, V=15) and solve for R

$V=IR\\15=(7.5)R$

Divide both sides by 7.5 to isolate R

$\frac{15}{7.5}= \frac{7.5R}{7.5} \\2=R$

Therefore, the circuit resistance would be 2 ohms.

I hope this helps!

4 0

3 years ago

An object that has momentum can NOT also be _____.

stiks02 [169]

Answer: B

Explanation:

The equation to find momentum is velocity*mass. Without velocity, there would be no momentum. Therefore the object CAN NOT be at rest.

6 0

3 years ago

Read 2 more answers

A 222 kg bumper car moving right at 3.10 m/s collides with a 165 kg bumper car moving 1.88 m/s left Find the total momentum of t

Svetlanka [38]

Answer:

Total momentum of the system is 378 kg-m/s

Explanation:

It is given that,

Mass of first bumper car, m₁ = 222 kg

Velocity of first bumper car, v₁ = 3.10 m/s (in right)

Mass of other bumper car, m₂ = 165 kg

Velocity of second bumper car, v₂ = -1.88 m/s (in left)

Momentum of the system is given by the product of its mass and velocity. So, the total momentum of this system is given by :

$p=m_1v_1+m_2v_2$

$p=222\ kg\times 3.10\ m/s+165\ kg\times (-1.88\ m/s)$

p = 378 kg-m/s

Hence, the total momentum of the system is 378 kg-m/s

5 0

3 years ago

Two red blood cells each have a mass of 9.05×10−14 kg and carry a negative charge spread uniformly over their surfaces. The repu

belka [17]

Answer:

v = 330.7 m/s

Explanation:

Let say initially the speed of two blood cells is v and they are far apart from each other

when they come to the closest distance to each other then in that case the initial total kinetic energy of two blood cells will convert into electrostatic potential energy of the cells

So we can say

$\frac{1}{2}mv^2 + \frac{1}{2}mv^2 = \frac{kq_1q_2}{2r}$

here we know that

$m = 9.05 \times 10^{-14} kg$

$q_1 = -2.50 pC$

$q_2 = -3.30 pC$

$r = 3.75 \times 10^{-6} m$

now we will have

$(9.05 \times 10^{-14})v^2 = \frac{(9 \times 10^9)(2.50 \times 10^{-12})(3.30 \times 10^{-12})}{2(3.75 \times 10^{-6})}$

$v^2 = 1.09 \times 10^5$

$v = 330.7 m/s$

5 0

3 years ago