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anastassius [24]
3 years ago
12

Plz helpppp............​

Physics
1 answer:
horsena [70]3 years ago
7 0

Explanation:

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pass:- HELLO

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a 4kg sample of water absorbs 500 joules of energy.How much did the water temp change.The specific heat of water is 4200 J/(kg C
Ymorist [56]

Answer:

0.02976°C

Explanation:

Heat Supplied = mcø

ø = 500/(4*4200)

ø = 0.02976 °C

3 0
3 years ago
A metal has a strength of 414 MPa at its elastic limit and the strain at that point is 0.002. Assume the test specimen is 12.8-m
ser-zykov [4K]

To solve this problem, we will start by defining each of the variables given and proceed to find the modulus of elasticity of the object. We will calculate the deformation per unit of elastic volume and finally we will calculate the net energy of the system. Let's start defining the variables

Yield Strength of the metal specimen

S_{el} = 414Mpa

Yield Strain of the Specimen

\epsilon_{el} = 0.002

Diameter of the test-specimen

d_0 = 12.8mm

Gage length of the Specimen

L_0 = 50mm

Modulus of elasticity

E = \frac{S_{el}}{\epsilon_{el}}

E = \frac{414Mpa}{0.002}

E = 207Gpa

Strain energy per unit volume at the elastic limit is

U'_{el} = \frac{1}{2} S_{el} \cdot \epsilon_{el}

U'_{el} = \frac{1}{2} (414)(0.002)

U'_{el} = 414kN\cdot m/m^3

Considering that the net strain energy of the sample is

U_{el} = U_{el}' \cdot (\text{Volume of sample})

U_{el} =  U_{el}'(\frac{\pi d_0^2}{4})(L_0)

U_{el} = (414)(\frac{\pi*0.0128^2}{4}) (50*10^{-3})

U_{el} = 2.663N\cdot m

Therefore the net strain energy of the sample is 2.663N\codt m

6 0
3 years ago
Concept map for kinetic energy, work and power
Helen [10]

Kinetic energy: the energy of motion

Work: the change in kinetic energy

Power: the rate of work done

Explanation:

The kinetic energy of an object is the energy possessed by the object due to its motion. Mathematically, it is given by:

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

where

m is the mass of the object

v is its speed

The work done an object is the amount of energy transferred; according to the energy-work theorem, it is equal to the change in kinetic energy of an object:

W=K_f - K_i

where

K_f is the  final kinetic energy

K_i is the initial kinetic energy

Finally, the power is the rate of work done per unit time. Mathematically, ti can be expressed as

P=\frac{W}{t}

where

W is the work done

t is the time elapsed

Learn more about kinetic energy, work and power:

brainly.com/question/6536722

brainly.com/question/6763771

brainly.com/question/6443626

brainly.com/question/7956557

#LearnwithBrainly

8 0
4 years ago
G = 10 N/kg or 10 m/s2
Irina18 [472]

Answer:

a) U_{g} = 40\,J, b) \eta = 70\,\%, c) v = 20\,\frac{m}{s}

Explanation:

a) The initial potential energy is:

U_{g} = (0.2\,kg)\cdot \left(10\,\frac{m}{s^{2}} \right)\cdot (20\,m)

U_{g} = 40\,J

b) The efficiency of the bounce is:

\eta = \left(\frac{14\,m}{20\,m} \right)\times 100\,\%

\eta = 70\,\%

c) The final speed of Danielle right before reaching the bottom of the hill is determined from the Principle of Energy Conservation:

K = U_{g}

U_{g} = \frac{1}{2}\cdot m \cdot v^{2}

v = \sqrt{\frac{2\cdot U_{g}}{m} }

v = \sqrt{\frac{2\cdot (40\,J)}{0.2\,kg} }

v = 20\,\frac{m}{s}

5 0
3 years ago
Norma kicks a soccer ball with an initial velocity of 10.0 meters per second at an angle of 30.0% if the ball moves though the a
Pepsi [2]
3.125 meters diving 10 and 3.2 the angel does not have a value in the equation but if you were to use it in a real life setting it will
6 0
3 years ago
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