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Jobisdone [24]
3 years ago
12

You are holding a block of wood with dimensions 3 cm 6 cm 9 cm on the palm of your hand. Which side must be touching your hand f

or you to experience the greatest force?
A. 3 cm x 6 cm side
B. 6 cm x 9 cm side
C. You will experience the same amount of force on all sides.
D. 9 cm x 3 cm side
Physics
2 answers:
Vlad1618 [11]3 years ago
8 0

Answer:

C. You will experience the same amount of force on all sides.

Explanation:

This is because the only force acting on your hand as a result of the wooden block is gravitational force because no external pressure is exerted on the block.

Gravitational force is a product of mass and acceleration. It has nothing to do with the surface area of the object.

Hence, regardless of the surface of the wooden block resting on your palm, the force remains the same.

Zarrin [17]3 years ago
5 0

C. You will experience the same amount of force on all sides.

The normal force of weight will not differ for different positions of the block.

But the force of pressure applied to the surface of your hand is per unit area. So the side with the smallest area (3 cm x 6 cm) will exert more pressure over a smaller area.

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What will be the force if the particle's charge is tripled and the electric field strength is halved? Give your answer in terms
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Answer:

1.5F

Explanation:

Using

E= F/q

Where F= force

E= electric field

q=charge

F= Eq

So if qis tripled and E is halved we have

F= (E/2)3q

F= 1.5Eq=>> 1.5F

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2 years ago
‘The Universe is expanding.’ Justify this statement with the Big bang model of universe and Hubble’s Law.
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Explanation:

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Laskar, J.: 1990, The chaotic motion of the solar system. A numerical estimate of the size of the chaotic zones, Icarus, 88, 266
balandron [24]

The chaotic nature of the Solar System excluding Pluto was established by the numerical computation of the maximum Lyapunov exponent of its secular system over 200 myr.

<h3>What is chaotic motion of the solar system ?</h3>

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7 0
1 year ago
As part of a safety investigation, two 1900 kg cars traveling at 20 m/s are crashed into different barriers. Part A Find the ave
DedPeter [7]

Answer:

-29.2\times 10^{3} N

Explanation:

We are given that

Mass of cars= m=1900 kg

Initial speed of car=u=20 m/s

Final speed of car=v=0

Time=\Delta t=1.3 s

We have to find the average force exerted on the car.

Average force=\frac{change\;in\;momentum}{\Delta t}

F_{avg}=\frac{mv-mu}{1.3}

F_{avg}=\frac{1900(0)-1900(20)}{1.3}

F_{avg}=\frac{-38000}{1.3}=-29.2\times 10^{3} N

Hence, the average force exerted on the car that hits a line of water barrels=-29.2\times 10^{3} N

8 0
3 years ago
A 500 W immersion heater is placed in a pot containing 1.00 L of water at 20oC. (a) How long will the water take to rise to the
tatiyna

Answer:

96 s.

Explanation:

(a)

From the question,

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

Where Q = heat required to boil the water, c = specific heat capacity of the water, m = mass of the water, t₂ = final temperature of water, t₁ = initial temperature of water

Note: The boiling point of water = 100 °C

Given: c = 4200 J/kg.°C, t₂ = 100 °C, t₁ = 20 °C

mass of water = density×volume

m = D×v, Where D = 1000 kg/m³, v = 1.00 L = 0.001 m³

Hence, m = 1000×0.001 = 1 kg.

Substitute into equation 1

Q = 4200×1(100-20)

Q = 4200×8

Q = 33600 J.

But,

P = Q/t................... Equation 2

make t  the subject of the equation

t = Q/P................. Equation 3

Where P = power, t = time

From the question,

70 % of the available energy is absorbed by water.

P = 0.7×500 = 350 W.

Substitute into equation 2

t = 33600/350

t = 96 s.

6 0
3 years ago
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