A 2.44 x 10^3 kg car requires 5.3 kJ of work to move from rest to some final speed. During this time, the car moves 27.4 m.

What formula do I use for the second question? For number 3 how is one energy converted to the other? ( using arrows ) I get num

Fed [463]

#2
Use the formula ... Kinetic energy = (1/2) x (mass) x (speed)²

#3 - a).
sun => energy travels as electromagnetic waves => reaches Earth as
 heat & light energy.

sun => absorbed in plants => eaten by animals => animals die =>
 decay into oil in millions of years => we burn the oil to get the energy.

#3 - b).
food I ate for lunch => metabolized into glucose by my body
 => some of it burned in my muscles to generate energy for immediate needs
 => the rest of it stored as fat for future needs.

#3 - c).
flower pot rolls off the ledge => gravity does work on it all the way down,
 producing the kinetic energy it has when it hits the floor.

#3 - d).
oil or natural gas is burned, releasing heat energy => energy is used
 to generate electricity => electricity flows through cables from the
 power generating plant to your home => hot plate plugged into the
 wall => turns electrical energy back into heat energy => heat energy
 is conducted into the bottom of the beaker, flows through the glass
 to the inside surface => heat energy is conducted from the inside of
 the glass to the water, which gets hotter as it absorbs more energy.
=============================

Note:
#1 on the sheet is wrong.
"Work = force x distance" that's correct
But 25-kg is the mass of the ball, not the gravitational force on it.
The force on it is (mass) x (gravity), called its "weight".
 That's (25-kg) x (9.8 m/s²) = 245 kg-m/s² = 245 newtons .

6 0

3 years ago

Momentum of the 2 kg mass moving with velocity 10 m/s is *

gulaghasi [49]

20 kg*m/s because there is 2 kg mass and 10 m/s so you can multiply.

8 0

4 years ago

What are the chances?

Sindrei [870]

Answer:

what ar the chances of what.

5 0

3 years ago

A wave travels along a stretched horizontal rope. The vertical distance from crest to trough for this wave is 13 cm and horizont

shepuryov [24]

Answer:

(A) The wavelength of this wave is $56\; \rm cm$ .

(B) The amplitude of this wave is $6.5\; \rm cm$ .

Explanation:

Refer to the diagram attached. A point on this wave is at a crest or a trough if its distance from the equilibrium position is at a maximum.

The amplitude of a wave is the maximum displacement of each point from the equilibrium position. That's the same as the vertical distance between the crest (or the trough) and the equilibrium position.

On the diagram, the distance between the two gray dashed lines is the vertical distance between a crest and a trough. According to the question, that distance is $\rm 13\; \rm cm$ for the wave in this rope.
On the other hand, the distance between either gray dashed line and the black dashed line is the distance between a crest (or a trough) and the equilibrium position. That's the amplitude of this wave.

Therefore, the amplitude of the wave is exactly $\displaystyle \frac{1}{2}$ the vertical distance between a crest and a trough. Hence, for the wave in this question,

$\begin{aligned}& \text{Amplitude}\\ &= \frac{1}{2} \times (\text{Vertical distance between crest and trough}) \\ &= \frac{1}{2} \times 13\;\rm cm = 6.5\; \rm cm\end{aligned}$ .

The wavelength of a transverse wave is the same as the minimum (horizontal) distance between two crests or two troughs. That's twice the horizontal distance between a crest and a trough in the same period.

$\begin{aligned}& \text{Wavelength}\\ &= 2 \times (\text{Horizontal distance between adjacent crest and trough}) \\ &= 2 \times 28\;\rm cm = 56\; \rm cm\end{aligned}$ .

4 0

3 years ago

In an evironmental system of subsystem, the mass balance equation is:__________.

kolbaska11 [484]

Answer:

Explanation:

The mass balance is an application of conservation of mass, to the analysis of physical system. This is given in an equation form as

Input = Output + Accumulation

The conservation law that is used in this analysis of the system actually depends on the context of the problem. Nevertheless, they all revolve around conservation of mass. By conservation of mass, I mean that the fact that matter cannot disappear or be created spontaneously.

8 0

4 years ago