All categories

3 years ago

Consider the following statements:

Physics

1 answer:

valentinak56 [21]3 years ago

4 0

Answer:

1. A only

Explanation:

First law of thermodynamics it sates that energy of the universe is constant.It is also known as energy conservation law.

Therefore according to the first law of thermodynamics ,the thermal energy of the system is unchanged.

Second law of thermodynamics states that ,it is impossible to make a device which take heat from higher temperature energy resource and give 100 % work without heat rejecting.

Therefore only option A is correct.

1. A only

You might be interested in

Alternators are installed on automobiles to power things like the lights and the radio. Which kind of device is an alternator? A

Vitek1552 [10]

Answer:

A. Generator

Explanation:

An alternator which is also called a generator basically converts mechanical energy into electric energy.

An alternator is used in a vehicle to charge the battery. It supplies electric power to the automobile.It is attached to the engine and is driven by a belt system . When the alternator does not charge the battery, it can be understood that it is not working as it no longer recharges the battery, though the engine of the automobile runs.

5 0

3 years ago

Read 2 more answers

Word bank- (u may use more than once)

pishuonlain [190]

1 is idk
2 is solvent
3 is gamma rays
4 is transmutation
5 is nuclear fission
6 is nuclear fusion
7 is tracer
8 is half life
9 is
10 is strong force
11 is radioactivity
12 is dissociation
13 is unsaturated solution
14 idk
16 is alpha particle
17 is radioactivity
18 is concentration
19 is solubility
20 is saturated solution
21 is dissociation
22 is saturated solution
23 is saturated solution
24 is idk
25 is electrolytes
26 is idk
27 is non electrolytes
28 is concentration
29 is dissociation
30 is idk

7 0

4 years ago

Which has more kinetic energy, a basketball rolling at a walking pace or a baseball rolling at the pace of someone running? How

icang [17]

Answer:

answer 2 because the baseball has less mass then the 1st one

8 0

3 years ago

What average power must be supplied to the rope to generate sinusoidal waves that have amplitude 0.200 m and wavelength 0.600 m

pychu [463]

Complete question:

A taut rope has a mass of 0.123 kg and a length of 3.54 m. What average power must be supplied to the rope to generate sinusoidal waves that have amplitude 0.200 m and wavelength 0.600 m if the waves are to travel at 28.0 m/s ?

Answer:

The average power supplied to the rope to generate sinusoidal waves is 1676.159 watts.

Explanation:

Velocity = Frequency X wavelength

V = Fλ ⇒ F = V/λ

F = 28/0.6 = 46.67 Hz

Angular frequency (ω) = 2πF = 2π (46.67) = 93.34π rad/s

Average power supplied to the rope will be calculated as follows

$P_{avg} =\frac{1}{2} \mu \omega^2 A^2 V$

where;

ω is the angular frequency

A is the amplitude

V is the velocity

μ is mass per unit length = 0.123/3.54 = 0.0348 kg/m

$P_{avg} =\frac{1}{2} ( 0.0348)(93.34 \pi )^2 (0.2)^2 (28)$ = 1676.159 watts

The average power supplied to the rope to generate sinusoidal waves is 1676.159 watts.

6 0

3 years ago

The 4.5 cm long second hand on a watch rotates smoothly. What is its angular velocity? What is the speed of the tip of the hand?

Vlada [557]

Angular velocity means how many radians/degrees is this hand passing by every second.
First, you realize it goes through a whole revolution (2 $\pi$ in radians) in 60 seconds.
This means for every second, it passes by:
$\frac{2 \pi }{60 s} = 0.105 \frac{rad}{sec}$

For the next part, you need to know this equation:
Tangential velocity=Angular velocity x radius (meters)
$velocity=0.105 \frac{rad}{sec} *0.045m$
$velocity=0.004725 \frac{meters}{sec}$

5 0

3 years ago