3 years ago

Field lines point straight out from all sides of an object. Which statement best describes the object?

Physics

2 answers:

Mashcka [7]3 years ago

8 0

It is positively charged.

Kay [80]3 years ago

7 0

Answer:

it is positively charged

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During which season is the big dipper closest to the horizon

krek1111 [17]

The season is autumn

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3 years ago

A 47.4 kg student runs down the sidewalk and jumps with a horizontal speed of 42 m/s onto a stationary skateboard

Tpy6a [65]

Answer:

3 kg

Explanation:

Momentum before = momentum after

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

After jumping on the skateboard, the student and the skateboard have the same velocity, so v₁ = v₂.

m₁u₁ + m₂u₂ = (m₁ + m₂) v

(47.4 kg) (4.2 m/s) + m (0 m/s) = (47.4 kg + m) (3.95 m/s)

m = 3 kg

8 0

4 years ago

A 77.0 kg firefighter climbs a flight of stairs 8.0 m high. how much work is required? 0 incorrect: your answer is incorrect. j

Alex73 [517]

<span>6160 joules

to lift 1 newton 1 metre requires 1 joule
there are 10 newtons in one kilo

so 77(kg) x 8 (metres) x 10 (newtons/kilo) = 6160 joules</span>

5 0

4 years ago

A 5.0 mm diameter proton beam carries a total current of 1.5mA. The current density in the proton beam, which increases with dis

slavikrds [6]

Answer:

Jedge = 0.076A/cm^2

Explanation:

If you want to know what is Jedge is convenient to use an integral. The total density current is given by:

$J_T=\int_{0}^{R}J_{edge}(\frac{r}{R})dr=J_{edge}(\frac{1}{R})(\frac{R^2}{2})=\frac{J_{edge}R}{2}$ (1)

But also, we have that the total current is

$I_T=J_TA\\\\J_T=\frac{I_T}{A}=\frac{1.5*10^{-3}A}{\pi(5*10^{-3})^2}=19.09\frac{A}{m^2}$

where we have used that 5mm=5*10^{-3}m.

By replacing (1) we obtain:

$J_{edge}=\frac{2J_T}{R}=\frac{2(19.09A/m^2)}{5*10^{-3}m}=7639.4\frac{A}{m^2}=0.076\frac{A}{cm^2}$

hope this helps!!

3 0

4 years ago

Read 2 more answers

Describe what happens to the magnitude of the net electrostatic force on the electron as the electron

solniwko [45]

Answer:

hm my mom said the net force changes

7 0

3 years ago