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3 years ago

5

How far can you get away from your little sister with a squirt gun filled with paint if you can travel at 3 m/s and you have 15s

before she sees you?

1 answer:

Kay [80]3 years ago

5 0

It would be what 3•15 is so that's 45 m i think

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A diverging mirror is .................

lyudmila [28]

Is there a multiple choice?

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4 years ago

A strip of copper 190 µm thick and 4.20 mm wide is placed in a uniform magnetic field of magnitude B = 0.78 T, that is perpendic

Veronika [31]

Answer:

V = 9.682 × 10^(-6) V

Explanation:

Given data

thick = 190 µm

wide = 4.20 mm

magnitude B = 0.78 T

current i = 32 A

to find out

Calculate V

solution

we know v formula that is

V = magnitude× current / (no of charge carriers ×thickness × e

here we know that number of charge carriers/unit volume for copper = 8.47 x 10^28 electrons/m³

so put all value we get

V = magnitude× current / (no of charge carriers ×thickness × e

V = 0.78 × 32 / (8.47 x 10^28 × 190 × 1.602 x 10^(-19)

V = 9.682 × 10^(-6) V

3 0

3 years ago

a ball is thrown with an initial velocity of 80 feet per second, at an angle of 40 degrees with the horizontal. Find the vertica

Scorpion4ik [409]

Well velocity is a vector quanity and we can brake vectors in to verticle and horizantal componontes threw these two formulas Vcostheta=Vx and Vsintheta=Vy

7 0

3 years ago

Convection currents occur in fluids because of temperature and______ differences. Convection currents transfer ______ energy thr

Alex777 [14]

Solution: (i) Density (ii) thermal

Liquids at lower temperatures have greater density when compared to liquids at higher temperatures.This is because, at higher temperatures, molecules have greater kinetic energy and hence they are spaced farther apart, when compared to molecules at lower temperatures. Thus, the colder layers of liquids are heavier than the warmer layers, which causes then to move down due to gravity. For the same reason, the hotter layers move upwards through the liquid.

When a liquid is heated, the molecules closest to the heat source have greater energy, their density becomes less and they move upwards. The colder layers sink downwards. The layers of the liquid which were cold initially, get heated and they travel upwards. As the process repeats, convection currents are set up in the liquid.

These currents transfer the thermal energy derived from the source throughout the liquid. The process stops when the entire liquid is at the same temperature.

Thus, convection currents occur in liquids due to temperature and <u>density</u> differences. Convection currents transfer <u>thermal</u> energy throughout a fluid.

5 0

4 years ago

Read 2 more answers

What is the energy in the spark produced by discharging the second capacitor? 1. The same as the discharge spark of the first ca

Nastasia [14]

Complete Question

The two isolated parallel plate capacitors be- low, one with plate separation d and the other with D > d, have the same plate area A and

are given the same charge Q.

What is the energy in the spark produced by discharging the second capacitor?

1. The same as the discharge spark of the first capacitor

2. More energetic than the discharge spark of the first capacitor

3. Less energetic than the discharge spark of the first capacitor

Answer:

The correct option is 2

Explanation:

The formula for the energy stored in the capacitor is

$U = \frac{Q^2}{2C}$

And generally the formula for finding the capacitance of a capacitor is

$C = \frac{\epsilon_oA}{d}$

We can denote the capacitance of the first capacitor as $C_1 = \frac{\epsilon_oA}{d}$

and denote the capacitance of the second capacitor as $C_2 = \frac{\epsilon_oA}{D}$

Looking at this formula we can see that C varies inversely with d

as D > d it means that $C_1 > C_2$

Since the charge is constant

$U\ \alpha\ \frac{1}{C}$ i.e U varies inversely with C

So $C_1 > C_2$ => $U_2 >U_1$

This means that the energy of spark would be more for capacitor two compared to capacitor one

The correct option is 2

6 0

4 years ago