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3 years ago

Which statement is true about the atom?

Physics

1 answer:

slavikrds [6]3 years ago

7 0

Answer:

Its d

atome contain

negative electrons,

positive protons and uncharged neutrons.

Explanation:

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What must the charge (sign and magnitude) of a particle of mass 1.49 g be for it to remain stationary when placed in a downward-

Kipish [7]

Answer;

= -2.18 × 10^-5 C

Explanation;

m = 1.49 × 10^-3 kg

Take downward direction as positive.

Fg = m g

E = 670 N/C

Fe = q E

Fe + Fg = 0

q E + m g = 0

q = -m g/E

= -1.49 × 10^-3 × 9.81/670

= -2.18 × 10^-5 C

= -2.18 × 10^-5 C

6 0

4 years ago

Let us be two cylindrical conductors connected in parallel, to which a potential difference of V = 170V is applied. The two cond

PSYCHO15rus [73]

The equivalent resistance of the two cylindrical conductors connected in parallel is 466 ohm.

<h3>Resistance</h3>

Resistance is a measure of the opposition to flow of electric current. It is measured in ohms.

It is given by the formula:

$R=\rho\frac{l}{A} \\\\where\ l=length,A=area,\rho=resistivity$

Given that R₂ = 469 ohm, hence:

$R_2=\rho\frac{l_2}{A_2} \\\\469=\rho\frac{l_2}{\pi r_2^2}$

But l₁ = 6l₂, r₁ = (1/5)r₂, hence:

$R_1=\rho \frac{l_1}{A_1}=\rho *\frac{6l_2}{[\pi (1/5)r_2]^2} =150 * \rho \frac{l_2}{[\pi r_2]^2}=30*469=70350\ ohm$

The equivalent resistance (R) is:

$R=\frac{R_1R_2}{R_1+R_1}=\frac{469*70350}{469+70350} =466\ ohm$

The equivalent resistance of the two cylindrical conductors connected in parallel is 466 ohm.

Find out more on resistance at: brainly.com/question/17563681

3 0

3 years ago

Honey bees can acquire a small net charge on the order of 1 pC as they fly through the air and interact with plants. Estimate th

murzikaleks [220]

Answer:

$3.35\cdot 10^{-16}N$

Explanation:

The force exerted on a charged particle due to a magnetic field is given by:

$F=qvB sin \theta$

where

q is the charge of the particle

v is the velocity of the particle

B is the magnetic field strength

$\theta$ is the angle between the directions of B and v

In this problem we have:

$q=1 pC=1\cdot 10^{-12} C$ is the charge of one honey bee

$v=15 mi/h = 6.7 m/s$ is the velocity of the bee

$B=5.0\cdot 10^{-5} T$ is the average strength of the Earth's magnetic field

$\theta=90^{\circ}$ , because the bee flies east to west while the Earth's magnetic field is south to north

Substituting into the equation, we find:

$F=(1\cdot 10^{-12}C)(6.7 m/s)(5.0\cdot 10^{-5} T)(sin 90^{\circ})=3.35\cdot 10^{-16}N$

7 0

3 years ago

A crew team rows a boat at a rate of 20 km/h in still water. In practice on a river, the team rows for 30 minutes up the river (

sweet-ann [11.9K]

In the second 30 mins, the speed should be 20 + 1.5 = 21.5 km/h

So S = 21.5 * 30/60 = 10.75 km

6 0

3 years ago

A force F is used to raise a 4-kg mass M from the ground to a height of 5 m. What is the work done by the force F? (Note: sin 60

miskamm [114]

Answer:

Answer:196 Joules

Explanation:

Hello

Note: I think the text in parentheses corresponds to another exercise, or this is incomplete, I will solve it with the first part of the problem

the work is the product of a force applied to a body and the displacement of the body in the direction of this force

assuming that the force goes in the same direction of the displacement, that is upwards

W=F*D (work, force,displacement)

the force necessary to move the object will be

$F=mg(mass *gravity)\\F=4kgm*9.8\frac{m}{s^{2} }\\ F=39.2 Newtons\\replace\\\\W=39.2 N*5m\\W=196\ Joules$

Answer:196 Joules

I hope it helps

5 0

3 years ago