2 years ago

Which of the following is not an example of a physical change?

Physics

1 answer:

Mazyrski [523]2 years ago

8 0

Answer:

Explanation:

Cutting a string in half because

b is irreversible

c is a cheical and d is also a chemical change

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Which unit do astronomers use for angular measurement?

Alex787 [66]

C and D are units of length or distance.
A is a measured angle.
B is a unit of angular measurement.

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2 years ago

What process is mostly responsible for the blue appearance of the sky

malfutka [58]

Answer:reflection by dust particles in air

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3 years ago

A uniform disk with a mass of 5.0 kg and diameter 30 cm rotates on a frictionless fixed axis through its center and perpendicula

igomit [66]

Answer:

Angular acceleration of the disk will be $\alpha =10.714rad/sec^2$

Explanation:

We have given mass of the disk m = 5 kg

Diameter of the disk d = 30 cm = 0.3 m

So radius $r=\frac{d}{2}=\frac{0.3}{2}=0.15m$

Moment of inertia of disk is given by $I=\frac{1}{2}mr^2=\frac{1}{2}\times 5\times 0.15^2=0.056kgm^2$

Force is given by F=4 N

Torque is given as $\tau =Fr=4\times 0.15=0.6N-m$

We also know that torque is given by $\tau =I\alpha$

$0.6=0.056\times \alpha$

$\alpha =10.714rad/sec^2$

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2 years ago

In terms of diameter, the planet Saturn is larger than _______ , but smaller than _______.

hram777 [196]

ANSWER:

NEPTUNE & JUPITER

5 0

2 years ago

An open cart is rolling to the left on a horizontal surface. A package slides down a chute and lands in the cart. Which quantity

Marat540 [252]

Answer: the horizontal component of total momentum

Explanation:

Since the open cart is rolling to the left on the horizontal surface, the quantity that has the same value just before and just after the package lands in the cart is the horizontal component of total momentum.

Momentum, is the product of the mass of a particle and the velocity of the particle. The change of momentum depends on the force which acts on it. The addition of the the individual momenta is the total momentum.

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2 years ago