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Nana76 [90]
3 years ago
13

Tim adds salt as he starts to heat a pot of water to cook pasta. When the water is boiling, he notices the salt has dissolved

Physics
1 answer:
katen-ka-za [31]3 years ago
3 0

Answer:

The salt is dissolved by the water and heat. If the pot isn't boiling, the salt wouldn't dissolve, it would stay undissolved.

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The Earth can be approximated as a sphere of uniform density, rotating on its axis once a day. The mass of the Earth is 5.97×102
svetlana [45]

Answer:

I = 97.2 10³⁶ kg m²

Explanation:

The moment of inertia of a body the expression of inertia in the rotational movement and is described by the expression

      I = ∫ r² dm

In this problem we are told to use the moment of inertia of a uniform sphere, the expression of this moment of inertia is

     I = 2/5 M r²

where m is the mass of the earth and r is the radius of the earth.

Let's calculate

      I = 2/5  5.97 10²⁴ (6.38 10⁶)²

      I = 97.2 10³⁶ kg m²

3 0
3 years ago
A 50 kg rock climber accidentally falls from the side of a rock and freefalls until she is stopped by her 9 m saftey rope. Assum
olchik [2.2K]

Answer:

a) 665 kg.m/s

b) 2.97 kN

Explanation:

The impulse is given by:

J=\Delta p\\J=m(v_a-v_b)

where

va=velocity after

vb=velocity before

The velocity just before is given by:

v_b=\sqrt{2*9.81m/s^2*9m}=13.3m/s(-\hat{j})

The velocity just after is zero because there wasn't a rebound.

So the impulse is:

J=50kg*(0-13.3m/s(-\hat{j}))\\J=50kg*(0+13.3m/s(\hat{j}))=665kg.m/s

The impulse is also given by:

J=\Delta p=F* \Delta t\\so:\\F=\frac{J}{\Delta t}\\\\F=\frac{665kg.m/s}{0.224s}=2.97kN

8 0
3 years ago
Which is a source of AC current? A) a battery B) a generator C) chemical cells wired in series D) chemical cells wired in parall
Mumz [18]

NOOO

its B

the correct source is a generator. The others are all sources of DC, a generator uses electromagnetic induction to create AC.

5 0
3 years ago
Read 2 more answers
An antelope moving with constant acceleration covers the distance 70.0 m between two points in time 6.60 s. Its speed as it pass
Veronika [31]

Answer:

A) The speed at the first point is 6.91 m/s.

B) The acceleration is 1.12 m/s²

Explanation:

The equations of velocity and position of the antelope will be as follows:

x = x0 + v0 · t + 1/2 · a · t²

v = v0 + a · t

Where:

x = position of the antelope at time t

x0 = initial position

v0 = initial velocity

t = time

a = acceleration

v = velocity at time t

A) If we place the origin of the frame of reference at the first point, we can say that at t = 6.60 the position of the antelope is 70.0 m and its velocity is 14.3 m/s. In this way, we will have 2 equations with 2 unknowns, the initial velocity (the velocity at the first point) and the acceleration.

Let´s start finding the speed at the first point:

v = v0 + a · t       (solving for "a")

(v - v0)/t = a

Replacing a = (v - v0)/t  in the equation of the position:

x = x0 + v0 · t + 1/2 · (v - v0)/t · t²             (x0 = 0)

x = v0 · t  + 1/2 · v · t - 1/2 · v0 · t

x - 1/2 · v · t = 1/2 · v0 · t

2/t · (x - 1/2 · v · t) = v0

2/6.60 s · (70.0 m - 1/2 · 14.3 m/s · 6.60s) = v0

v0 = 6.91 m/s

The speed at the first point is 6.91 m/s.

B) Using the equation of velocity

a = (v - v0)/t

a = (14,3 m/s - 6.91 m/s) / 6.60 s

a = 1.12 m/s²

The acceleration is 1.12 m/s²

4 0
3 years ago
Two identical objects are moving directly toward one another at the same speed what is the the total kinetic energy of the syste
galina1969 [7]
 <span>Just add the two kinetic energies; 
E = (1/2)mv^2 + (1/2)mv^2</span>
6 0
3 years ago
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