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3 years ago

On a summer afternoon, the sand on the beach can get very hot. When you step on the sand in bare feet, you can burn yourself.

2 answers:

8 0

Heat from the Sun is transferred to the sand without direct contact. This heat is then transferred to your feet by direct contact.

topjm [15]3 years ago

7 0

The second sentence best represents the situation because the sun does not touch the sand so direct contact is not made. Then, your feet do touch the sand so direct contact is made. Thus, "Heat from the sun is transferred to the sand without direct contact. This heat is then transferred to your feet by direct contact." is the best answer.

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A 0.290 cm diameter plastic sphere, used in a static electricity demonstration, has a uniformly distributed 30.0 pC charge on it

mojhsa [17]

Answer:

Therefore,

The potential (in V) near its surface is 186.13 Volt.

Explanation:

Given:

Diameter of sphere,

d= 0.29 cm

$radius=\dfrac{d}{2}=\dfrac{0.29}{2}=0.145\ cm$

$r = 0.145\ cm = 0.145\times 10^{-2}\ m$

Charge ,

$Q = 30.0\ pC=30\times 10^{-12}$

To Find:

Electric potential , V = ?

Solution:

Electric Potential at point surface is given as,

$V=\dfrac{1}{4\pi\epsilon_{0}}\times \dfrac{Q}{r}$

Where,

V= Electric potential,

ε0 = permeability free space = 8.85 × 10–12 F/m

Q = Charge

r = Radius

Substituting the values we get

$V=\dfrac{1}{4\times 3.14\times 8.85\times 10^{-12}}\times \dfrac{30\times 10^{-12}}{0.145\times 10^{-2}}$

$V=\dfrac{30}{16.117\times 10^{-2}}=186.13\ Volt$

Therefore,

The potential (in V) near its surface is 186.13 Volt.

3 0

4 years ago

How large must the coefficient of static friction be between the tires and the road if a car is to round a level curve of radius

mixas84 [53]

The magnitude of static friction is

f = mv ²/r

(i.e. the net force acting on the car parallel to the road points toward the center of the curve)

while the net vertical force must be

∑ F = n - mg = 0

because the car is otherwise in equilibrium. Then

==> n = mg

==> f = µn = µmg = mv ²/r

==> µ = v ²/(rg)

We have

v = 101 km/h ≈ 28.1 m/s

r = 110 m

g = 9.80 m/s²

so that

µ = (28.1 m/s)² / ((110 m) g) ≈ 0.730

6 0

3 years ago

The bodies in this universe attract one another name the scientist who propounded this statement

murzikaleks [220]

Answer:

It was proposed by Isaac Newton

Explanation:

The law of universal attraction of expression

F = $G \ \frac{m_1m_2}{ r^2}$ G m1m2 / r ^ 2

where G is a constant, m₁ and m₂ are the masses of the bodies and r the distance between them.

It was proposed by Isaac Newton

With this law Newton explained that the force that pulls the moon towards the earth is the same as that which attracts an apple towards the earth

8 0

3 years ago

The epidermis contains melanocytes, pigment cells that produce

MrRa [10]

Answer:

melanin

Explanation:

8 0

3 years ago

Read 2 more answers

A soccer ball initially at rest rolls down a hill with an acceleration of 3.0 m /s2 .it accelerates for 5 seconds before melissa

slavikrds [6]

The correct answer is the Soccer ball is 3.2 plus 5 that’s your answer.

6 0

3 years ago