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3 years ago

Each large pizza can feed three teenage boys. How many pizzas would be needed to feed the

Physics

2 answers:

Blababa [14]3 years ago

6 0

Answer:

19 pizzas

Explanation:

1 pizza = 3 boys

=> 56 ÷ 3 = 18.666666666666.. or about 19 pizzas

Xelga [282]3 years ago

4 0

18.666666666666666 or round to 19

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Near the surface of Earth an electric field points radially downward and has a magnitude of approximately 100 N/C. What charge (

pentagon [3]

Answer:

$q=2.997\times 10^{-4}$ C

Sign-Negative

Explanation:

We are given that

Electric field = $E=100NC^{-1}$ (Radially downward)

Acceleration= $0.19 ms^{-2}$ (Upward)

Mass of charge=3 g= $3\times 10^{-3}$ kg

1kg=1000g

We have to find the magnitude and sign of charge would have to be placed on a penny .

By newton's second law

$\sum F_y=ma$

$\sum F_y=qE-mg$

Substitute the values then we get

$qE-mg=ma$

Substitute the values then we get

$q(100)-3\times 10^{-3}(9.8)=3\times 10^{-3}(0.19)$

$100q-29.4\times 10^{-3}=0.57\times 10^{-3}$

$100q=0.57\times 10^{-3}+29.4\times 10^{-3}=29.97\times 10^{-3}$

$q=\frac{29.97\times 10^{-3}}{100}$

$q=2.997\times 10^{-4}$ C

Sign of charge =Negative

Because electric force acting in opposite direction of electric field therefore,charge on penny will be negative.

4 0

3 years ago

A bead moves in a fixed direction during an interval. The graph shows the displacement of the bead from its starting point. What

Maksim231197 [3]

Answer:A

Explanation:

I just did the same question on usatestprep

5 0

3 years ago

A step index fiber has a numerical aperture of NA = 0.1. The refractive index of its cladding is 1.465. What is the largest core

Vladimir [108]

Answer:

diameter = 9.951 × $10^{-6}$ m

Explanation:

given data

NA = 0.1

refractive index = 1.465

wavelength = 1.3 μm

to find out

What is the largest core diameter for which the fiber remains single-mode

solution

we know that for single mode v number is

V ≤ 2.405

and v = $\frac{2*\pi *r}{ wavelength} NA$

here r is radius

so we can say

$\frac{2*\pi *r}{ wavelength} NA$ = 2.405

put here value

$\frac{2*\pi *r}{1.3*10^{-6}} 0.1$ = 2.405

solve it we get r

r = 4.975979 × $x^{-6}$ m

so diameter is = 2 × 4.975979 × $10^{-6}$ m

diameter = 9.951 × $10^{-6}$ m

3 0

3 years ago

Which object has the most gravitational potential energy?

zysi [14]

PE = mgh, so you're looking for the heavier object higher up.
Multiply the given mass and height to see which is more.

A. (30)(1.5) = 45
B. (20)(2) = 40
C. (30)(2) = 60
D. (20)(1.5) = 30

So C has the most gravitational potential energy

3 0

3 years ago

Read 2 more answers

How far will a runner travel at an average speed of 5m/s for 20 minutes?

Sonja [21]

Multiply the speed and time to get your answer of how far the runner travels

6 0

3 years ago