Which object is completely opaque?

Physics

1 answer:

Pavel [41]3 years ago

7 0

Answer:

Explanation:

light can not pass through it completely

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What does friction oppose

Mekhanik [1.2K]

Answer:

Friction opposes motion.

Explanation:

If there is relative motion, the frictional force is the kinetic force of friction.

7 0

3 years ago

A uniform bar has two small balls glued to its ends. The bar has length L and mass M, while the balls each have mass m and can b

vazorg [7]

Answer:

Explanation:

Length of bar = L

mass of bar = M

mass of each ball = m

Moment of inertia of the bar about its centre perpendicular to its plane is

$I_{1}=\frac{ML^{2}}{12}$

Moment of inertia of the two small balls about the centre of the bar perpendicular to its plane is

$I_{2}=2\times m\times \frac{L^{2}}{4}$

$I_{2}=\frac{mL^{2}}{2}$

Total moment of inertia of the system about the centre of the bar perpendicular to its plane is

I = I1 + I2

$I=\frac{ML^{2}}{12}+\frac{mL^{2}}{2}$

$I=\frac{(M +6m)L^{2}}{12}$

8 0

3 years ago

the wires inside a cable each have there own plastic insulation .why does the insulasion have diffrent colours

marta [7]

A cable is a bundle of two wires or three wires or a thousand wires,
inside a single 'tube'. In order for the cable to be useful, you need to
be able to match each wire at one end of the cable to the same wire
at the other end. If each wire has a different physical appearance,
then it's easy.

6 0

4 years ago

A pumpkin with a mass of 3.3 kg is launched from a catapult at an initial height of 3.8 m off the ground, with an initial speed

dimaraw [331]

Answer:

11.2m

Explanation:

Suppose the pumpkin is launched vertically and the speed of 13.9 m/s is absolutely vertical. As the pumpkin rises up, its kinetic energy is converted to potential energy, let the reference point be the round, we can create the following equation from the law of energy conservation:

$E_1 + P_1 = E_2 + P_2$