All categories

3 years ago

A small 22 kilogram canoe is floating downriver at a speed of 3 m/s. What is the canoe's kinetic energy?

2 answers:

6 0

Kinetic energy = 1/2 (mass)(speed squared).

According to somebody on the river bank watching the canoe float by, it has 99 joules of kinetic energy.

According to anybody in another boat, floating down the same river, the canoe has no kinetic energy at all.

They're both correct, each in his own frame of reference.

amid [387]3 years ago

4 0

Kinetic energy can be calculated using the following rule:
kinetic energy = 0.5*m*v^2 where:
m is the mass = 22 kg
v is the velocity = 3 m/sec

Substitute with the givens in the above equation to get the kinetic energy as follows:
kinetic energy = 0.5(22)(3)^2
kinetic energy = 99 Joules

You might be interested in

A lamp is connected to the power supply.

Vika [28.1K]

Answer:

There are 45 turns in the secondary coil.

Explanation:

Given that,

Input potential of the lamp, $V_{in}=5\ V$

The output potential of the lamp, $V_{out}=1.5\ V$

Number of turns in primary coil, $N_P=150$

We need to find the number of turns needed on the secondary coil. We know that the ratio for a transformer is as follows :

$\dfrac{V_{out}}{V_{in}}=\dfrac{N_s}{N_P}\\\\N_s=\dfrac{V_{out}N_P}{V_{in}}\\\\N_s=\dfrac{1.5\times 150}{5}\\\\N_s=45\$

So, there are 45 turns in the secondary coil.

5 0

3 years ago

What percent of the energy used in the united states come from burning fossil fuels?

andreyandreev [35.5K]

Here is a link that should help you out
http://instituteforenergyresearch.org/topics/encyclopedia/fossil-fuels/

8 0

3 years ago

Which state Which states of matter have a set volume? Explain why this is, based on the animations you observed for the differen

Lyrx [107]

Answer: Solid

Explanation: There are 3 major state of matter - solid, liquid and gas.

Among the 3 state, solid has a fixed volume while liquid takes the volume of its container. When gas is compressed, it takes the volume of its container likewise.

7 0

3 years ago

The student draws an arrow on the paper to mark the incident ray. She marks the

garri49 [273]

Answer:

Explanation:

Snell's law

1.00sin66 = nsin38

<u>n = 1.48</u>

3 0

3 years ago

Why do you want the water to drip off the metal before it is placed in the calorimeter?

VMariaS [17]

Answer:

(A) The mass and the initial temperature of the calorimeter water will be incorrect and affect the calculation of the specific heat capacity of the metal.

8 0

3 years ago