What is the mechanical advantage of a wedge that is 2 inches at its widest part and has a sloped side with a length of 10 inches?a. 0.2b. 5c. 8d. 20
Answers
Answer:
B) 5
Explanation:
Mechanical advantage = D/W
= 10/2
= 5.
It has no unit because the inches in the length and width will cancel out.
Related Questions
Which best describes how heat flows? A. Heat flows from a warmer object to a colder object. B. Heat flows in any direction. C. Heat flows from a colder object to a warmer object. D. All objects transfer to their heat to all other objects.
Which of the following are capital cities in the Caribbean? Lima La Habana San Juan San Jos Guinea Ecuatorial
Which description could describe the motion of the object between 7 and 12 seconds (the highlighted area)?a. The object is moving at a constant, negative, velocity. It is negative because it is moving back towards the origin.b. The object is at rest.c. The object is going down a hill with a changing speed.d. The object is speeding up, as it travels back towards the origin.
A proton moves along the x axis according to the equation x = 38 t + 14 t2, where x is in meters and t is in seconds. Calculate (a) the average velocity of the proton during the first 3.0 s of its motion, (b) the instantaneous velocity of the proton at t = 3.0 s, and (c) the instantaneous acceleration of the proton at t = 3.0 s.
2. A stationary ball on the ground
3. A sleeping dog
4. A boy running across the street
5. A car traveling on the road
6. A stretched rubber band
7. A basketball being thrown
8. A girl biking at the park
9. A leaf lying on the ground
10. A planet revolving around a star
Answers
1. An apple falling from a tree: Kinetic energy increases as it falls, while potential energy decreases.
2. A stationary ball on the ground: No kinetic energy (it's not moving), but it has potential energy due to its position above the ground.
3. A sleeping dog: The dog has potential energy due to its position above the ground, but it's not in motion, so there's no significant kinetic energy.
4. A boy running across the street: The boy has both kinetic and potential energy. His motion represents kinetic energy, and his position above the ground while running represents potential energy.
5. A car traveling on the road: The car has both kinetic energy (due to its motion) and potential energy (due to its position above the road).
6. A stretched rubber band: The stretched rubber band has potential energy stored in its stretched configuration.
7. A basketball being thrown: The basketball has both kinetic energy (while it's in motion) and potential energy (when it's at the highest point of its trajectory).
8. A girl biking at the park: Similar to the boy running, the girl on the bike has both kinetic and potential energy.
9. A leaf lying on the ground: The leaf has potential energy due to its position above the ground, but it has little to no kinetic energy unless it's moving in the wind.
10. A planet revolving around a star: The planet has both kinetic energy (due to its orbital motion) and potential energy (related to its position within the gravitational field of the star).
In general, potential energy is associated with an object's position or state, while kinetic energy is associated with its motion.
Answers
Answers
A. Nebular is the answer
281 Hz
322 Hz
Answers
Answer:
322 Hz
Explanation:
v = speed of train approaching the railroad crossing = 80 km/h = 80 x 1000/3600 m/s = 22.22 m/s
V = speed of sound of the horn of train = 331.5 m/s
f = actual frequency of the sound from the horn = 300.0 Hz
f' = observed frequency of the horn
Using Doppler's effect, observed frequency is given as
f' = V f/(V - v)
inserting the values
f' = (331.5) (300.0)/(331.5 - 22.22)
f' = 322 Hz
h
Calculate the energy of this photon in joules. [Show all work, including the equation and substitution with
units.]
Answers
The energy of the photon in joules, given that it's has a frequency of 5.48×10¹⁴ Hz is36.33×10¯²⁰ J
Data obtained from the question
- Frequency (f) = 5.48×10¹⁴ Hz
- Energy (E) =?
How to determine the energy
- Planck's constant (h) = 6.63×10¯³⁴ Js
- Frequency (f) = 5.48×10¹⁴ Hz
- Energy (E) =?
The energy of the photon can be obtained as follow:
E = hf
E = 6.63×10¯³⁴ × 5.48×10¹⁴
E = 36.33×10¯²⁰ J
Learn more about energy:
#SPJ2
If you notice any mistake in my english, please let me know, because i am not native.
Answers
(100 watts) = 100 joules per second
(100 joules/second) x (90 seconds) = 9,000 joules .
I did that because the "100 watts" on the label on the front of the
microwave oven is the "cooking power" ... the power of the radio
waves that it shoots into the chamber to heat the soup or the meatloaf.
The whole appliance actually uses a lot more power than that to do its job.
The light, the turntable, and the cooling fan all use some power, and the
magnetron is not 100% efficient, so the appliance has to put way more
than 100 watts into the magnetron to wind up with 100 watts available
to shoot to the meatloaf.
When you ask "How much energy does it use ?", the answer is:
A lot more than what eventually comes blasting into the chamber
to actually cook with.