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4 years ago

A small 22 kilogram canoe is floating downriver at a speed of 2 m/s. What is the canoe's kinetic energy

2 answers:

4 0

Kinetic energy is simply 1/2 *mass* velocity^2
so since you know both mass and velocity you should be able to calculate the kinetic energy.

Anna [14]4 years ago

4 0

A student on a raft floating behind the canoe says the canoe has NO kinetic energy.
A teacher standing on the riverbank when the canoe floats by says it has 44 joules of KE.
They're both correct.

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Game officials are accepted as the rule experts for any competition they oversee. true or false

Nat2105 [25]

Answer:

True

Explanation:

I Got It Right On Edge :)

8 0

3 years ago

Two long, parallel wires separated by 2.00 cm carry currents in opposite directions. The current in one wire is 1.75 A, and the

Natasha_Volkova [10]

The force per unit length between the two wires is $6.0\cdot 10^{-5} N/m$

Explanation:

The magnitude of the force per unit length exerted between two current-carrying wires is given by

$\frac{F}{L}=\frac{\mu_0 I_1 I_2}{2\pi r}$

where

$\mu_0 = 4\pi \cdot 10^{-7} Tm/A$ is the vacuum permeability

$I_1, I_2$ are the currents in the two wires

r is the separation between the two wires

For the wires in this problem, we have

$I_1 = 1.75 A$

$I_2 = 3.45 A$

r = 2.00 cm = 0.02 m

Substituting into the equation, we find

$\frac{F}{L}=\frac{(4\pi \cdot 10^{-7})(1.75)(3.45)}{2\pi (0.02)}=6.0\cdot 10^{-5} N/m$

Learn more about current and magnetic fields:

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4 0

4 years ago

3. A 0.98 kg rock is attached to a 0.40-m rope and spun in a vertical

diamong [38]

Answer: v = 6.0 m/s

Explanation:

T = m(v²/R - g)

(T/m + g)R = v²

v = √((79.0/0.98 + 9.81)0.40) = 6.0140... ≈ 6.0 m/s

3 0

3 years ago

Why do electric field lines cannot cross?

Feliz [49]

Electric field 'lines' were invented by people, to have a visualization of the
electric field. We draw 'lines' to show the direction of the force that a tiny
test charge would feel if it were at any point in the field, and the direction
it would move from there.

If 'lines' crossed, then there would be a point in the field where a tiny test
charge would feel a force in two different directions, and it would have a
choice of which way to go from there. That doesn't happen.

4 0

3 years ago

Read 2 more answers

Explain what happens when a massive star ends its life as a supernova.

Step2247 [10]

Bang.

<span>No seriously, that is what will happen. The constant exchange between pressure and gravity will result in a supernova explosion when the star will literally implode and then explode, shedding all the remaining gasses into outer space. </span>

<span>What will be left, will depend on the original mass, either a neutron star or a black hole. </span>

7 0

4 years ago