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3 years ago

Please help need answers asap

Physics

1 answer:

Soloha48 [4]3 years ago

4 0

Answer- Helium
You can by the number of protons, and if you look at a periodic table the atomic number of helium is the same as the number of protons

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You push very hard on a heavy desk, trying to move it. You do work on the desk:

frozen [14]

Answer:

Explanation:

We know that work done is given by

$W=F.d=Fdcos\Theta$

So there are two case in which work done is zero

First case is that when force and displacement are perpendicular to each other

And other case is that when there is no displacement

So for work to be done there must have displacement, if there is no displacement then there is no work done

So option (c) will be the correct option

3 0

3 years ago

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

The United States and South Korean soccer teams are playing in the first round of the World Cup. An American kicks the ball, giv

Aleks04 [339]

Answer:v=2.82 m/s

Explanation:

Given

initial velocity of ball(u)=3.6 m/s

ball rolls a distance(s) of 5 m

ball acceleration $=-0.5 m/s^2$

Velocity of ball when it is intercepted by Korean player

$v^2-u^2=2as$

$v^2=3.6^2+2(-0.5)(5)=7.96$

$v=\sqrt{7.96}$

$v=2.82 m/s$

3 0

3 years ago

Which statement describes a characteristic of a question that can be answered through scientific inquiry? A. It can be answered

saw5 [17]

Answer:

the correct one is D

Explanation:

A question that can be answered with a scientific investigation must be a question where measurements of some kind can be made and with these measurements check that the question is correct or not.

When examining the answers the correct one is D

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3 years ago

If the Moon's orbit were perpendicular to the ecliptic, would eclipses be possible? What would be the most common phase of the M

tangare [24]

Answer:no

Explanation:

5 0

4 years ago

Please help need answers asap ​

Please help need answers asap