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2 years ago

6

Please help on this one?

2 answers:

-Dominant- [34]2 years ago

8 0

The answer is B. Hope this helps

butalik [34]2 years ago

7 0

B. +Q, + W are the correct sign

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A 2.45 g table tennis ball has the KE of 31.5 J. At what velocity is the tennis ball traveling?

Ket [755]

KE =
$\frac{1}{2} mv {}^{2}$
Convert g in kg
Find v:
2KE = mv^2
v=√2KE/m
v=√2*31.5/0.00245
v=160 m/s

3 0

3 years ago

Read 2 more answers

What is common to the terrestrial planets? A. equal rotational periods around the Sun B. thin crust and a dense iron core C. sol

Darya [45]

Answer:

I would say D. All terrestrial planets are made up of rock and minerals and the other planets are made up of that do not have a solid surface.

Answer D.

Explanation:

7 0

2 years ago

A)If your torsion balance deflects to an angle of 10° when your two spheres are 40cm apart, what angle will it deflect to when t

svp [43]

Answer:

Explanation:

Given

for $\theta=10^{\circ}$

Sphere are $d=40\ cm$

when sphere $d_2=10\ cm$ apart suppose deflection is $\theta _2$

We know

$F=k_t\cdot \theta$

Where F=force between charged particle

$\theta =$ Deflection

$F=\frac{kQ_1Q_2}{r^2}=k_t\cdot \theta$

$\theta =\frac{k}{k_t}\times \frac{Q_1Q_2}{r^2}----1$

thus $\theta \propto \frac{1}{r^2}$

for $\theta _2$

$\frac{\theta _1}{\theta _2}=(\frac{r_2}{r_1})^2$

$\theta _2=16\times \theta _1$

$\theta _2=160^{\circ}$

(b)for $10^{\circ}$ deflection Potential $v_1=8\ kV$

Electric Potential is $V=\frac{kQ}{r}$

$Q=\frac{V\cdot r}{k}$

where V=voltage

k=constant

r=distance between charges

Put value of Q in equation 1

$\theta =\frac{k}{k_t}\times \frac{V^2r^2}{k^2}$

$\theta =\frac{V^2r^2}{k\cdot k_t}$

thus $\theta \propto V^2$

therefore

$\frac{\theta _1}{\theta _2}=(\frac{V_1}{V_2})^2$

$\frac{10}{\theta _2}=(\frac{8}{4})^2$

$\theta _2=\frac{10}{4}=2.5^{\circ}$

5 0

2 years ago

I just need an answer ASAP

nikdorinn [45]

Answer: c

Explanation: hope this helps :)

8 0

2 years ago

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A woman lifts her 100-newton child up one meter and carries her for a distance of 50 meters to the 3.2

lianna [129]

(100 N) x (1 m) =<span>= 100 J

hope that helps</span>

4 0

3 years ago