4. Which of the following best describes Kinetic Energy?Stored energy due to position
Energy of motion
Force applied over a distance
A push or pull exerted on an object
Answers
Answer:
Energy Of Motion
Explanation:
Related Questions
Ho Chi Minh led the Communist forces in Indochina and in North Vietnam. a. Trueb. False Hitler and Mussolini headed two of the Axis powers of World War II. a. Trueb. False
Stars are powered by nuclear fusion reactions. True or false?
At a maximum level of loudness, the power output of a 75-piece orchestra radiatedas the sound is 70.0 W. What is the intensity of these sound waves to a listener who issitting 25.0 m from the orchestra?
If sediment is pushed along the underside of a glacier, what would occur?
gram/mL
(fill in the number)
Answers
Answer:
1.00 gram per milliliter (1 g/mL). In other words, 1 milliliter of water has a mass of 1 gram. A drop of water is 0.05 mL of water, so its mass would be 0.05 grams.
Explanation:
Answers
Answer:
Explanation:
This problem is an example of a perfectly inelastic collision. After the collision, the two cars merge into a single object. So in order to find the velocity of that object, we need to find the velocity of the center of mass of the given system of 2 cars.
Mass of Ford = = 2080 kg
Mass of truck = = 18400 kg
Velocity of Ford = = 22.6 m/s north
Velocity of truck = = 10.4 m/s east
Let us break up the velocity vector into 2 components, one along north () and one along east (
).
Therefore,
(speed of truck along the north is zero)
Similarly,
(speed of Ford along the east is zero)
Hence, the resultant speed of the entangled cars is given by,
and the direction is given by (please refer to the figure attached),
Final answer:
The post-collision speed and direction of the two entangled vehicles, calculated using principles of momentum conservation and trigonometry, are found to be 9.82 m/s and 76.4 degrees east of north respectively.
Explanation:
In this scenario, we are dealing with the principles of momentum conservation. In a collision like this one, the total momentum before the collision equals the total momentum after the collision, as long as no external forces are acting on the system. The momentum (p) of an object is calculated as the mass (m) of the object multiplied by its velocity (v), or p=mv.
Before the collision, the total momentum of the system (ptotal) is the sum of the momentum of the Ford Explorer (pExplorer) and the garbage truck (ptruck). After the collision, they move together as a single object, so their combined mass and velocity would make up the total momentum.
Based on the given information, pExplorer = 2080 kg * 22.6 m/s = 47,008 kg*m/s and ptruck = 18400 kg * 10.4 m/s = 191,360 kg*m/s. The direction should also be taken into account. Since they are perpendicular to each other, we can use the Pythagorean Theorem to find the resultant momentum: (pExplorer)^2 + (ptruck)^2 = ptotal^2, which gives a total momentum of 201,262.8 kg*m/s.
Now, the total mass (mtotal) of two entangled vehicles is 2080 kg + 18400 kg = 20480 kg. Hence the velocity (v) of the two vehicles after the collision is calulated by ptotal divided by mtotal : 201262.8 kg*m/s / 20480 kg = 9.82 m/s. The direction is calculated using trigonometrics such as tan(-1)(ptruck / pExplorer) which gives a direction of 76.4 degrees east of north.
Learn more about Momentum Conservation here:
#SPJ3
Answers
Potential energy =
(mass) x (gravity) x (height above the reference level) .
Relative to the bottom of the cliff, the potential energy
at the top of the cliff is
(25kg) x (9.8 m/s²) x (30 meters)
= (25 x 9.8 x 30) kg-m²/s²
= 7,350 joules .
Kinetic energy = (1/2) x (mass) x (speed²)
The rock's kinetic energy at the bottom is
the same as its potential energy at the top.
7,350 joules = (1/2) x (25 kg) x (speed²)
Divide each side
by 12.5kg : 7,350 joules/12.5 kg = speed²
7,350 kg-m²/s² / 12.5kg = speed²
(7,350 / 12.5) m²/s² = speed²
588 m²/s² = speed²
Take the square root
of each side:
Speed = √(588 m²/s²)
= 24.248... m/s (rounded)
We have our formula for potential energy, which we are trying to solve for,
PE = mgh or potential energy = mass * gravity * height
So we know that PE all depends on these.
Height : 30 meters
Mass : 25 kg
Gravity (which is always constant) : 9.8 m/s/s
Now add into formula.
PE = 25*30*9.8
PE = 7350 Joules
Answer: PE = 7350 Joules
Answers
Temparature
Humidity (Amount of molecules in the air)
Explanation
Examples of environmental factors are, temperature, wind, pressure, humidity etc. Kinetic energy is the energy possessed by a body in motion.
This motion can be affected by factors such as rain and humidity since the make the medium more dense. It require more energy to move in a denser medium.
Diffusion is the movement of molecules from a region of high concentration to a region of low concentration. When temperatures are high the molecules get more energy and move more faster increasing the rate of diffusion.
Answers
Answer:
70.15 Joule
Explanation:
mass of man, m = 70 kg
intial length, l = 11 m
extension, Δl = 1.5 m
Let K is the spring constant.
In the equilibrium position
mg = K l
70 x 9.8 = K x 11
K = 62.36 N/m
Potential energy stored, U = 0.5 x K x Δl²
U = 0.5 x 62.36 x 1.5 x 1.5
U = 70.15 Joule
Answers
In fact, the temperature T of a system is directly proportional to the internal energy U of the system, and the first law of thermodynamics states that the variation of internal energy of a system is given by
where
Q is the heat added to the system
W is the work done by the system on the surroundings
We see from the formula that we have 2 possible cases:
1) the heat added to the system (Q) is greater than the work done by the system (W) -->
2) the heat added to the system (Q) is less than the work done by the system (W) -->
Therefore, it's not true that when heat is added to the system, its temperature must increase: it depends on the value of the work done, W. So, the original statement is false.