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Difficulty Set

 Problem Established Essay

Energy

1 . A guy climbs on a wall that is a few m large and increases 2200 L of potential energy. What is the mass of the person?

Given: Method:

h sama dengan 5 millimeter = PE/gh

PE = 2200 T

Solution:

m = 2200 J as well as (9. almost eight m/s2 times 5 m)

m = 49 kilogram

2 . Compute the kinetic energy of a 500 kilogram car traveling at 40 m/s. Offered: Formula:

m = 500 kgKE = mv2/2

sixth is v = 50 m/s

Answer:

KE = 500 kg x (50 m/s)2 / 2

KE = 625 000 M

Power

a few. Riley climbs a flight of stairs in 4 minutes. If he weighs seven hundred N and the stairs is 20 m from the ground, simply how much power will certainly she develop?

Given: Solution:

t sama dengan 3 mins = 180 sP sama dengan Wd/t

W = seven hundred N

g = 20 m

Answer:

P = 700 N x twenty m / 180 s

P = 77. 8 J/s

four. How much electricity is developed by a car that runs eighty m/s if the force is equal to 60 000 In.

Given: Formulation:

V sama dengan 80 m/sW = Fv

F = 50 000 N

Answer:

W sama dengan 50 000 N times 80 m/s

W = 4 1000 000 J/s

Electricity

a few. Charges of 6 and + 4 nC are 3 meters apart. Identify the force they apply on each additional, and the electrical field in a point half way between them. Presented: Formula:

k = 9 x 109Felec = k q1 q2 /r2

q1 = 6 by 109 C

q2 = 4 by 109 C

r sama dengan 3 m

Felec = (9 x 109)(6 x 109)(4 x 109)/32

Felec= twenty-four x 109 N

six. A 60 cm part of nichrome wire is used in a home heating aspect. The combination sectional area of the wire is 0. 05 mm2. Precisely what is the amount of resistance of the warming element? When it is operated in household current (110 V), how much high temperature is manufactured in one minute? ( Nichrome sama dengan 100 x 10-8 Ω-m) Given:

A =. 05 mm2 = (. 05)(10-3)2 sama dengan. 05 back button 10-6 m2, and

L = 50 centimeter =. 5 m.

Formulation:

R sama dengan ПЃL/A

Answer:

R = (100 back button 10-8)(. 5)/(5 x 10-8)

Ur = 15 ohms

several. A eight volt power supply supplies capacity to a cordless curling iron with a level of resistance of 18 ohms. How much current is definitely flowing through the curling straightener? Given:

Ur = 18 ohms Method:

V = 9 v I = V/R

Solution:

I sama dengan 9 v / 18 ohms

I = zero. 5 A

8. Offered:

V sama dengan 9 v

R1 = 3 ohms

R2 = 3 ohms

R3 = 3 ohms

Formula:

My spouse and i = V/(R1 + R2 + R3)

Solution:

My spouse and i = 9/(3 + several + 3)

= 9/9

I sama dengan 1 A

9.

The whole current from this circuit is 12 A.

Determine:

a) the voltage passing through every single resistor

V sama dengan V1 = V2 = V3 = 24 V

b) the total resistance

1/Rtotal sama dengan 1/R1 & 1/R2 + 1/R3

Rtotal = Vtotal/ Itotal = 24/12 = 2 О©

c) the cost of resistor R3

1/R3 = 1/Rtotal - 1/R1 -1/R2 = (1/2) – (1/12) – (1/4) = (6/12) – (1/12) – (3/12) = 2/12 ohm

1/R3 sama dengan 1/6, R3 = 6 О©

Thickness

10. A bar procedures 12 millimeter x twenty mm back button 1 m. В It has a specific the law of gravity of 2. 78. Determine it is mass. Given:

H sama dengan 12 millimeter

T = twenty mm

L = 1 m

sp. gr. sama dengan 2 . 79

Solution:

V = H back button W x L

Solution:

V = doze mm back button 20 mm x 1 m

V = 1 . 2 cm x 2 centimeter x 100 cm

V sama dengan 240 closed circuit

sp. gr. = m as well as (mass of your equal volume of water)

m = sp. grms. x (mass of an equal volume of water)

m = installment payments on your 78 by 240g

m = 667. a couple of g

11. Some unknown material has an complicated shape. Very low mass of 126 g. В You submerge this to find that displaces 422 ml of water. What is the specific the law of gravity of the part? m sama dengan 126 g

Versus = 422 ml

sp. grms. = m / (mass of an similar volume of water)

sp. gr. = m / (mass of the equal amount of water)

sp. gr. = 126 g / 422 g

sp. gr. = 0. 298578

sp. gr. sama dengan 0. 40

Pressure

12. Calculate the pressure produced by a force of 800 And acting on a place of 2. zero m2. Provided:

F = 800 And

A sama dengan 2 . 0 m2

Formula:

P sama dengan F / A

Remedy:

P sama dengan (800 N) / (2. 0 m2)

P sama dengan 400 In / m2

P sama dengan 400 Pennsylvania

13. В The pressure of a gas found in a cyndrical tube with a portable piston is definitely 300 Pennsylvania. The area of the piston can be 0. your five m2. Estimate the power that is exerted on the piston.

Given:

S = 300 Pa

A = zero. 5m2

Method:

F = P A

Solution:

N = (300 Pa) (0. 5 m2)

F = 150 (Pa) m2

= one hundred and fifty (N / m2) m2...

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