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4 years ago

Which is not one of the forms that energy can take?

2 answers:

4 0

Question 1: Newtonian. It refers to work of Newton. Light, electrical and chemical energies are different forms of energy.
Question 2: Nuclear power plants. Heat , Sunlight and energy in atoms are not nuclear energies.
Question 3: Batteries. the other two are examples of mechanical energy. But batteries are examples for chemical energy.

mezya [45]4 years ago

3 0

1. B
2. D
3. C
4. C
5. C
6. A
7. B

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Find the useful power output (in W) of an elevator motor that lifts a 2600 kg load a height of 30.0 m in 12.0 s, if it also incr

Annette [7]

Answer:

P = 251,916.667 W

Cost = 2,267.25 cents

Explanation:

To solve this question we will use the Work Energy Theorem, which is

$W = dP + dK\\$

Where

$dP$ = Change in Potential Energy

$dK$ = Change in Kinetic Energy

Change in Potential Energy

$P_{i} = mgh_{i}\\ P_{f} = mgh_{f}$

Where

$P_{i}$ = Initial Potential Energy

$P_{f}$ = Final Potential Energy

$m$ = Mass of System = 10,000 kg

$g$ = Acceleration due to gravity = 9.81 m/s

$h_{i}$ = Initial Height = 0

$h_{f}$ = Final Height = 30 m

Inputting the values we get the answer for $dP$

$dP = P_{f} - P_{i}\\dP= mgh_{f} - mgh_{i}\\ dP= 10000(9.81)(30) - 0\\ dP= 2943000$

Change in Kinetic Energy

$K_{i} = \frac{1}{2} mv_{i} ^2\\ K_{f} = \frac{1}{2} mv_{f} ^2$

Where

$K_{i}$ = Initial Kinetic Energy

$K_{f}$ = Final Kinetic Energy

$m$ = Mass of System = 10,000 kg

$g$ = Acceleration due to gravity = 9.81 m/s

$v_{i}$ = Initial Velocity = 0 m/2

$v_{f}$ = Final Velocity = 4 m/s

Inputting the values we get the answer for $dK$

$dK = K_{f} - K_{i}\\ dK = \frac{1}{2} mv_{f} ^2 - \frac{1}{2} mv_{i} ^2\\ dK = \frac{1}{2} (10000)(4)^2 - 0 \\ dK = 80000$

Total Work

$W = dP + dK\\$

Inputting the values

$W = 2943000 + 80000$

$W = 3,023,000$

a) Finding the useful Power Output

$P = \frac{W}{t}$

Where

$P$ = Power Output

$W$ = Work Done = 3,023,000J

$t$ = Time = 12s

Inputting the values

$P = \frac{3,023,000}{12}\\ P = 251,916.667$

P = 251,916.667 W

b) Finding the Total Cost

Cost = $0.0900 x P/1000

Cost = $0.0900 x (251,916.667/1000)

Cost = $22.67 or 2,267.25 cents

4 0

4 years ago

A patient visited a doctor and complained that from the last 2 months, his urine output is very low. After examination, the doct

Dvinal [7]

Answer:

kidney

Explanation:

thats where your pee goes through

8 0

3 years ago

Read 2 more answers

a 2.4*10^2 N force is pulling an 85 kg refrigerator across a horizontal surface. the force acts at an angle of 20.0 above the su

shepuryov [24]

Answer:

a) The work done by pulling force, W = 1804.21 joules

b) The work done by the kinetic frictional force is, w = 1332.8 J

Explanation:

Given,

The pulling force, Fₐ = 2.4 x 10² newton

The mass of the refrigerator, m = 85 Kg

The angle of pulling force acting to the surface, ∅ = 20°

The coefficient of kinetic friction is, μₓ = 0.200

The distance covered by the refrigerator, s = 8 m

The force acting in the direction parallel to the surface is given by

F = Fₐ cos∅

∴ F = 2.4 x 10² x cos 20°

=225.53 N

The work done by the pulling force is given by

W = F · S

= 225.53 N x 8 m

= 1804.21 joules

The work done by the pulling force, W = 1804.21 joules

The kinetic friction force is given by the formula

Fₓ = μₓ · η

Where

μₓ - coeficient of kinetic frictoin

η - Normal force, (mg)

∴ Fₓ = 0.200 x 85 x 9.8

= 166.6 N

The work done by the kinetic frictional force is given by

w = Fₓ · S

= 166.6 N x 8 m

= 1332.8 J

Hence, the work done by the kinetic frictional force is, w = 1332.8 J

7 0

3 years ago

Read 2 more answers

In the 1980s, the term picowave was used to describe food irradiation in order to overcome public resistance by playing on the w

Lerok [7]

Answer:

E = 1.24MeV

Explanation:

The photon travels at the speed of light, 3.0 × $10^{8}$ m/s, and given that its frequency = 1 picometer = 1.0 × $10^{-12}$ m.

Its energy can be determined by;

E = hf

= (hc) ÷ λ

where E is the energy, h is the Planck's constant, 6.626 × $10^{-34}$ Js, c is the speed of the light and f is its frequency.

Therefore,

E = (6.626 × $10^{-34}$ × 3.0 × $10^{8}$ ) ÷ 1.0 × $10^{-12}$

= 1.9878 × $10^{-25}$ ÷ 1.0 × $10^{-12}$

E = 1.9878 × $10^{-13}$ J

But, 1 eV = 1.6 × $10^{-19}$ J. So that;

E = $\frac{1.9878*10^{-13} }{1.6*10^{-19} }$

= 1242375 eV

∴ E = 1.24MeV

The energy of the photon is 1.24MeV.

5 0

3 years ago

as a professional teacher, who has been assigned to teach science in an elementary school class, design activities to teach sour

Anastasy [175]

Answer:

Elementary school teachers.

Explanation:

Elementary school teachers create teaching strategies and introduce a variety of subjects to learners. Teachers at the elementary school develop lesson plans on subjects like social studies, science, mathematics, etc. Elementary school teachers empower and encourage young children to cultivate a passion for learning and education that lasts for life. They are charged for creating a positive learning atmosphere within the classroom for all students.

6 0

3 years ago