3 years ago

Which best describes the magnitude of the velocity of the car?

Physics

1 answer:

Vlad [161]3 years ago

6 0

I think 30 as that’s usually average speed

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A slender rod is 80.0 cm long and has mass 0.290 kg. A small 0.0200 kg sphere is welded to one end of the rod, and a small 0.050

fenix001 [56]

Answer:

V= 1.2m/s

Explanation:

Since both spheres fall to an equidistant center, both spheres travel a distance of 0.4m

This is:

The 0.05kg sphere falls 0.4m while the 0.02kg sphere goes up 0.4m

The decrease in Potential Energy is given by:

$\Delta PE = (m2-m1) * g * h = (0.05-0.02) * 9.8 * 0.4 = 0.1176 J$

The moment of inertia for the entire system is given by:

$I = \frac{mL ^ 2}{12}+(m1 + m2) (\frac{L}{2} )^2$

$I = 0.290kg * (0.8m) ^ 2/12 + 0.07kg * (0.4m)^2 = 0.026Kg * m^2$

In this way the kinetic energy is given by

$KE = \frac{1}{2} Iw^2$

$0.1176J = \frac{1}{2}* 0.026Kg *m^2 * w^2$

$w = 3 rad / s$

$v = wr = 3 * 0.4 = 1.2m / s$

6 0

4 years ago

Boyle's Law states that when a sample of gas is compressed at a constant temperature, the pressure P and volume V satisfy the eq

Zigmanuir [339]

Answer:

100 cm^3/min

Explanation:

PV = C

V = 400 cm^3

P = 160 kPa

dP/dt = + 40 kPa/min

According to the question

PV = C

Differentiate both sides with respect to time

P x dV/dt + V x dP/dt = 0

160 x dV/dt = - 400 x 40

dV/dt = - 100 cm^3/min

The volume decreases by the rate of 100 cm^3/min.

3 0

4 years ago

You leave a hammer in the sun for several hours. When you pick it up, heat is transferred to your hand. How is most of the heat

zmey [24]

Because it is touching, the heat is being transferred via conduction.

4 0

3 years ago

In your own words, describe how matter is identified.

pochemuha

Matter can be how much is taken in a space.

6 0

3 years ago

Read 2 more answers

Choose all the answers that apply. Which of the following forces require physical contact? tension, air resistance, friction, ma

svet-max [94.6K]

Answer:

I belive it would be friction applied force and tension

Explanation:

8 0

4 years ago