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3 years ago

Which hand is negatively charged?

Physics

2 answers:

liq [111]3 years ago

7 0

The second hand is negatively charged

Digiron [165]3 years ago

5 0

The second is negatively charged since there are more electrons than protons.

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Boxes A and B are in contact on a horizontal, frictionless surface. Box A has mass 21.0 kg and box B has mass 8.0 kg. A horizont

vfiekz [6]

Answer:

2.75 N

Explanation:

Given that,

Box A has a mass 21.0 kg and box B has a mass 8.0 kg.

A horizontal force of 100N is exerted on box A.

Let a be the acceleration of the system. Using second law of motion,

$F=(m_A+m_B)a\\\\a=\dfrac{F}{(m_A+m_B)}\\\\a=\dfrac{10}{(21+8)}\\\\a=0.344\ m/s^2$

Now applying Newton's second law to box B. So,

$F_A=m_Ba\\\\=8\times 0.344\\\\=2.75\ N$

So, 2.75 N is the force that box A exerts on box B.

8 0

3 years ago

Fill in the chart below to identify the name of the process that explains the state of change indicated, the states of matter be

yuradex [85]

1. Changing from solid to a liquid is called melting / fusion and happen

at the melting/ fusion point.

Reason: melting point is a temperature at which a solid melt and converts into liquid by providing heat.

2. Changing from liquid to gas is called evaporation/boiling and happens at the evaporation/boiling point.

Reason. Evaporation is a process in which molecules from surface of liquid convert into gas.

3. Changing from a gas to a liquid is called condensation and happens at the condensation point.

Reason : In condensation process gas particles converts into liquid droplets.

4. Changing from liquid to a solid is called freezing and happens at the freezing point.

Reason : Freezing is a process that convert liquid into soilid state by decreasing temperature of that specific liquid,

3 0

4 years ago

Read 2 more answers

Volcanic eruptions are caused primarily by the movement of

Assoli18 [71]

The answer is Tectonic Plates

4 0

3 years ago

A bicycle wheel is rotating with an angular velocity of 15 rad/s. The wheel has a mass of 4.9 kg and a radius of 48.6 cm. Treat

riadik2000 [5.3K]

Answer:

a) kinetic energy = 130.2j

b) angular velocity when kinetic energy is doubled = 21.2rad/s

3 0

3 years ago

A stone is dropped into a river from a bridge 44.0 m above the water. Another stone is thrown vertically down 1.72 s after the f

Mariana [72]

Answer:

u₀ = 17.14 m/s

Explanation:

given,

bridge height = 44 m

initial speed of the first stone = 0 m/s

initial speed of the second stone = ?

difference after which the second stone is thrown = 1.72 s

for stone 1

$h = ut + \dfrac{1}{2}gt^2$

$h =\dfrac{1}{2}gt_1^2$

for stone 2

$h = u_0 (t_1-t) + \dfrac{1}{2}g (t_1-t) ^2$

$t_1 =\sqrt{\dfrac{1}{2}gh}$

$t_1 = \sqrt{\dfrac{1}{2}\times 9.81\times 44}$

t₁ = 14.69 s

$44 = u_0 \times 1.72 + \dfrac{1}{2}g\times 1.72 ^2$

u₀ = 17.14 m/s

8 0

4 years ago