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3 years ago

Derrick crawls 4 feet south, and then turns east and crawls 6 feet.

Physics

1 answer:

Anna35 [415]3 years ago

7 0

Answer:

4 is initial distance and 6 is final distance or displacement

Explanation:

displacement is the shortest distance between final and initial distance...

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If the mass of a wheel is increased by a factor of 7 and the radius is increased by a factor of 15, by what factor is the moment

inn [45]

Answer:

The moment of inertia will be increased by a factor of 1575

Explanation:

Let the moment of inertia of a wheel be given as;

$I = \frac{1}{2} mr^2\\\\$

where;

I is the moment of inertia of the wheel

m is mass of the wheel

r is radius of the wheel

when the mass is increased by a factor of 7 and the radius is increased by a factor of 15

$I_1 = \frac{1}{2}mr^2\\ \\I_2 = \frac{1}{2}(7m)(15r)^2\\\\I_2 = \frac{1}{2}(7m)(225r^2)\\\\I_2 = 7\times 225[\frac{1}{2}(mr^2)]\\\\I_2 = 1575[\frac{1}{2}(mr^2)]\\\\Recall, \frac{1}{2}(mr^2) = I_1 \\\\I_2 = 1575 I_1$

Thus, the moment of inertia will be increased by a factor of 1575

3 0

3 years ago

An engine raises 120kg of water through a height of 40m in 30s.What is the power of the engine take gravity to be = 10m/s.

alexgriva [62]

Answer:

1600 W

Explanation:

Power is the product of force and distance, divided by time.

P = (120 kg)(10 m/s²)(40 m)/(30 s) = 1600 kg·m²/s³ = 1600 W

3 0

3 years ago

When current flows through a wire of length L and cross-sectional area A, the resistance in the wire

alisha [4.7K]

Answer:

(6) Is proportional to L and inversely proportional to A.

Explanation:

I will explain it mathematically, following formula relates Resistance to length of wire L and cross sectional area A.

$R = p\frac{L}{A}$

here, p is greek letter 'Rho' is called resistivity of the wire and L is lenght and A is cross sectional area of the wire.

By inspection we can tell that as length increases the resistance of wire increase, so resistance must be directly propoetional to length.

and resistance decrease as cross sectional area A decreases.

So the resistance must be directly proportional to Length of wire and inversly proportional to cross sectional area of wire.

option number (6) fits all of our deductions.

8 0

4 years ago

Read 2 more answers

What is the difference between atoms and particals? Help

Otrada [13]

An atom is the smallest unit of matter that forms a chemical element. An atom is made up of three kinds of subatomic particles: electrons, protons, and neutrons.A molecule is a combination of atoms bonded together through a covalent bond. Generally, we think of molecules as having no charge (although molecular ions do exist)

7 0

3 years ago

What is the acceleration of a 100 kg object that experience a net force of -10N?

IceJOKER [234]

Answer:

a = -1/10 m/s2

Explanation:

F = m*a

-10N = 100*a

a = -10/100

a = -1/10 m/s2

3 0

3 years ago

Read 2 more answers