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77julia77 [94]
3 years ago
7

The study of motion is called ________

Physics
2 answers:
8_murik_8 [283]3 years ago
6 0
The study of motion is called- kinematics

I hope this helped
Salsk061 [2.6K]3 years ago
5 0

The study of motion is called kinematics.

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A 1.0-kg block of aluminum is at a temperature of 50°C. How much thermal energy will it lose when its temperature is reduced by
Marat540 [252]

Answer:

22425 J

Explanation:

From the question,

Applying

Q = cm(t₂-t₁).................. Equation 1

Where Q = Thermal Energy, c = specific heat capacity of aluminium, m = mass of aluminium, t₂ = Final Temperature, t₁ = Initial Temperature.

Given: c = 897 J/kg.K, m = 1.0 kg, t₁ = 50 °C, t₂ = 25 °C (The final temperature is reduced by half)

Substitute these values into equation 1

Q = 897×1×(25-50)

Q = 897×(-25)

Q = -22425 J

Hence the thermal energy lost by the aluminium is 22425 J

5 0
3 years ago
From the three lines in our Displacement vs Time graph, which line represents the highest velocity?
Crazy boy [7]

Answer:

line 3.

Explanation:

5 0
3 years ago
If conducted accurately, identical investigations should produce similar results. Sometimes, errors, like measurement errors, ca
Flura [38]

Answer: A) Sandra discovered several rabbits had been munching on her pea plants, while Jeremy had none.

Explanation:

3 0
3 years ago
In which of these situations, is mechanical energy being conserved? (Neglect, air resistance, friction, and breaking) Check all
Amiraneli [1.4K]

1) Mechanical energy is conserved in all the situations mentioned

2) True

3) Potential energy

4) The potential energy is 490 J

5) The potential energy is 750,000 J

Explanation:

1)

The mechanical energy of an object is the sum of its potential energy (PE) and its kinetic energy (KE):

E=PE+KE

When there are no conservative forces acting on the object (i.e. air resistance of friction), the mechanical energy is always conserved, so it is constant:

E=const.

This means that there is a continuous conversion between potential energy and kinetic energy.

In all the examples mentioned here, there are no air resistance or friction acting on the system: therefore, mechanical energy is conserved in all cases.

2)

The potential energy of the object falling to the ground is given by

PE=mgh

where

m is the mass

g is the acceleration of gravity

h is the height of the object above the ground

While the kinetic energy is given by

KE=\frac{1}{2}mv^2

where

v is the speed of the object

As the object falls, its height h decreases, while the speed v increases: therefore, the potential energy decreases and it is converted into kinetinc energy, which increases.

3)

The energy possessed by an object due to its position is called potential energy. It can be of two types:

- Gravitational potential energy: it is the energy possessed by an object due to its position in a gravitational field. It is given by

PE=mgh

where m is the mass, g the acceleration due to gravity, h the height of the object

- Elastic potential energy: it is the energy stored in an elastic object which is compressed or stretched - it is given by

PE=\frac{1}{2}kx^2

where k is the spring constant and x the elongation of the object relative to its equilibrium position.

4)

The (gravitational) potential energy stored in the block is calculated  as

PE=mgh

where:

m = 10 kg is the mass of the block

g=9.8 m/s^2 is the acceleration due to gravity on Earth's surface

h = 5  m is the height of the object above the ground

Substituting, we find the potential energy:

PE=(10)(9.8)(5)=490 J

5)

The potential energy of the elevator is given by

PE=mgh

In this case, we have

h = 500 m (height of the elevator)

W = 1500 N (weight of the elevator)

We also know that the weight is the product of mass and acceleration due to gravity:

W=mg

So we can rewrite the first equation as

PE=Wh

And substituting, we find

PE=(1500)(500)=750,000 J

Learn more about potential energy:

brainly.com/question/1198647

brainly.com/question/10770261

#LearnwithBrainly

5 0
3 years ago
An actual refrigerator operates with a COP that is half the Carnot COP. It removes 10 kW of heat from a cold reservoir at 250 K
Leya [2.2K]

Answer:

Explanation:

Given

\left ( COP\right )_{actual}=0.5\left ( COP\right )_{ideal}

T_L=250 K

T_H=300 K

ideal COP=\frac{T_L}{T_H-T_L}=\frac{250}{300-250}=5

\left ( COP\right )_{actual}=2.5

Also COP=\frac{Desired\ effect}{Power\ supplied}

2.5=\frac{10}{W_{in}}

W_{in}=4 kW

(b)if T_L=200 K

\left ( COP\right )_{actual}=0.5\times \frac{200}{300-200}=1

thus W_{in}=10 kW

6 0
3 years ago
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