Answer:
D
Explanation:
Mechanical energy is all about movement
Also kinetic and potential energy are mechanical
A circuit has a voltage drop of 12 V across a 30 2 resistor that carries a
current of 0.8 A. How much power is used by the resistor? Use P = VI.
A. 360 W
B. 12W
C. 9.6 W
D. 24 W
Answer:
C
Explanation:
V=12v
I=0.8A
P=VI
=(12)(0.8)
=9.6W
Answer:
9.6
Explanation:
Which of the following is NOT a vector quantity?
(A) Acceleration
(B) Average velocity
(C) Linear momentum
(D) Potential energy
(E) Force
Answer:
D
Explanation:
Acceleration has both magnitude and direction. because velocity is vector quantity
average velocity is vector
linear momentum = mass× velocity
therefore it's also vector
force = mass× acceleration
acceleration is vector therefore force also vector
potential energy= mgh
energy in any form is scaler quantity therefore potential energy too is a scaler quantity.
The direction of a vector that points somewhere between due north and due
east is measured in
A. centimeters
B. degrees
C. hours
D. miles
Answer: B
Degree
Explanation:
The direction of vectors are always measured in angles starting from the north. That is, in an anticlockwise direction. But the unit of angle is degree. Therefore, the direction of a vector that points somewhere between due north and due east is measured in degree.
Answer:degrees
Explanation:
Curtains over a window are an example of _____. A. transmission B. a medium for light C. how light waves do not require a medium D. a substance that does not transmit a wave
Answer:
C
Explanation:
we know that light doesn't need a medium through which to travel because the speed of light is experimentally constant: independent of the movement of the source or detector or the direction in which it travels.
7. How does friction affect the kinetic energy of an object?
Answer:
Friction is a resistive force to motion. When two bodies move against each other some of the kinetic energy is converted to heat energy due to friction. This reduces the total kinetic energy in the system. ... Mechanical energy is reduced due to friction and converted to heat.
Explanation:
Kinetic friction does oppose the relative motion of two surfaces. If the one of these surfaces is stationary, then it will tend to slow down the moving object.
The mean diameter of the Earth is 12.76 x 103 km. What is the surface area of the Earth in m2 ?
(A) 4.01 x 107
(B) 5.12 x 1014
(C) 1.09 x 1021
(D) 1.68 x 109
(E) 2.05 x 1015
Answer:
The Answer is B
Explanation:
Hope this Helps :D
What is D ?
Its name the wave diagram.
B: Crest
A: Trough
C: wavelength
I think can someone check that. I think D might be amplitude but i don’t know.
Answer:
wave height ( H)
Explanation:
it is the total summation of crest and trough
helpp me pleassee....
Answer:
The fundamental wavelength of the vibrating string is 1.7 m.
Explanation:
We have,
Velocity of wave on a guitar string is 344 m/s
Length of the guitar string is 85 cm or 0.85 m
It is required to find the fundamental wavelength of the vibrating string. The fundamental frequency on the string is given by :
[tex]f=\dfrac{v}{2l}\\\\f=\dfrac{344}{2\times 0.85}\\\\f=202.35\ Hz[/tex]
Now fundamental wavelength is :
[tex]\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{344}{202.35}\\\\\lambda=1.7\ m[/tex]
So, the fundamental wavelength of the vibrating string is 1.7 m.
A wave is traveling from one medium to another.If the wave is partially transmitted an partially reflected from the boundary,what will happen to the amplitude of the reflected wave?
Answer: the answer is C
Explanation:
What area specializes in the identification and examination of skeletal remains?
If the billing cycle length for a credit card is one calendar month, which of the
following months will result in the greatest periodic interest rate?
O A. December
B. June
C. April
!!!2O D. September
Answer: A.) December
Explanation:
December has the highest number of days in the options given above, with 31 days compared to the others with 30 days within a calendar month. The billing cycle is used to refer to a time interval between the end and the next billing or statement date. In the scenario above, the billing cycle length is monthly, meaning the periodic interest will be paid over a 31 day span time before thre beginning of another cycle.
For example, if periodic interest is $1 per day, this amount totals ($1 × 31) in december compared to the ($1 × 30) Interest in the June, April and September billing cycle.
How much blood does the average adult have
Heat always flows from a what place to a what place
Answer:
Heat is always the transfer of energy from an object at a higher temperature to an object at a lower temperature.
Explanation:
Answer:
Heat flows from high temperature to low temperature
Explanation:
the answer also may vary it can also be the heat flows from a warmer to colder place
hope this helped!
The acceleration due to gravity on the Moon is less than the acceleration due to gravity on the Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?
(A) Mass is less, weight is the same.
(B) Mass is the same, weight is less.
(C) Both mass and weight are less.
(D) Both mass and weight are the same.
(E) Mass is more, weight is less.
Answer:
(B) Mass is the same, weight is less.
Explanation:
Just took test
Which term best describes this step of the investigative process?
question
communication of results
peer review
experiment control
Answer:
peer review
Explanation:
The investigative process involves the development and inclusion of the steps involved to find an answer or solution to a specific question. Certain steps are followed in the process. The hypothesis is formulated, tested, and modified during the whole process. peer review involves the suggestions, comments, and interpretation of people in similar fields about the hypothesis. The given extract focuses on the investigative process of peer-reviewing. The review of the scientists from different countries has been asked to give their suggestions and advice on the journal before its publication.
A golfer is teeing off on a 130.0 m long par 3 hole. The ball leaves with a velocity of 35.0 m/s at 35.0° to the horizontal. Assuming
that she hits the ball on a direct path to the hole, how far from the hole will the ball land (no bounces or rolls)?
Answer:
The ball will land 12.5m before that hole.
Explanation:
The motion of the golf ball can be considered as a projectile motion, where first its height is 0, then it keeps increasing to a maximum point, after which its height starts decreasing again and hits the ground (height becomes 0 again).
We need to calculate the Range (horizontal distance) of the ball which is given as:
[tex]R=\frac{v_i^2{\cdot}sin2\theta}{g}[/tex]
Where
v(i) = initial velocity = 35 m/s
θ = Initial angle = 35°
g = gravitational acceleration = 9.8 m/s
Substitute in the given formula to find Range:
[tex]R=\frac{(35)^2\cdot{sin}(2)(35)}{9.8}\\R=\frac{(1225)(0.94)}{9.8}\\R = 117.5~m[/tex]
Distance between the hole and position where ball lands = 130m - 117.5m = 12.5m
What is the mass of an object that has a weight of 80.0 N?
Explanation:
SUPONIENDO QUE LA ACELERACIÓN DE LA GRAVEDAD ES [tex]9.80 m/s^{2}[/tex]
USANDO LA SEGUNDA LEY DE NEWTON:
m = 80.0 N/[tex]9.80 m/s^{2}[/tex] = 8.16 kg
Answer:
8kg
Explanation:
using the formula Force(F)=mass(m)×acceleration(a),
since we are finding the mass of the object,we will make m the subject by dividing both sides by a.
you will now get m= f/a
the acceleration on Earth is usually 10m/s
m= 80/10
m= 8/1 which is also 8kg
What is the momentum of a man of mass 10kg when he walks with a uniform velocity of 2m/s.
(point stealers will be reported so pls dont do it)
Answer:
[tex]Momentum(p) = 20kgm/s[/tex]
Explanation:
Given
Mass = 10kg
Velocity = 2m/s
Required
Calculate the momentum of the man
Momentum is calculated as thus
[tex]Momentum(p) = Mass(m) * Velocity(v)[/tex]
or
[tex]p = mv[/tex]
So; to solve this question; we simply substitute 10kg for mass and 2m/s for velocity in the above formula;
The formula becomes
[tex]Momentum(p) = 10kg * 2m/s[/tex]
[tex]Momentum(p) = 10 * 2 * kg * m/s[/tex]
[tex]Momentum(p) = 20kgm/s[/tex]
Hence, the momentum of the man is [tex]20kgm/s[/tex]
describe what factors can make it difficult to reintroduce captive animals into their natural habitats.
Answer:
Captive animals are animals that are maintained by people in an enclosed place not allowing them to be free. There are several factors that make it difficult to reintroduce them to their natural habitats like:
-Captive animals don't learn the necessary skills to survive in their natural habitats like hunting skills.
-They are too used to have contact with people which makes them vulnerable to hunters.
-Sometimes these animals are not able to integrate with a wild population.
-It has been found that some captive animals are more susceptible to diseases.
Select the smallest value from the choices below. (A) 15 x 10-3 (B) 0.15 x 100 (C) 0.00015 x 103 (D) 150 x 10-3 (E) 0.00000015 x 106
Answer:
E
Explanation:
Plug all of them into a graphing calculator and you will see that the last one is the smallest of them all
Answer:
E
Explanation:
Just use comon sense you will get the answer (No offense)
A group of students gather for some fun during their summer break from school. Kendall and Jacoby have a water balloon fight during one of those “lazy” days of summer.
Marie, Gary, and Lois remember a video about work that their science teacher, Ms. Lewis, showed them before they left for vacation.
Marie says: “If Kendall throws a water balloon at Jacoby, there is no work being done. It’s just boys being boys.”
Gary says: “If Kendall throws a water balloon at Jacoby, there is work being done by Jacoby because he has to run.”
Lois says: “If Kendall throws a water balloon at Jacoby, there is work being done because Kendall had to exert a force that made the water balloon travel a certain distance to hit Jacoby.”
Which one of them is correct and why? Answer in complete sentences! You can type on this document and turn in.
Answer:
lois is right because throwing the water balloon is exerting a force running is not
Please help and show workings.
Effective resistance = 2+1.5 = 3.5 ohms
Current in the circuit = 1.2 A
Lost volts in the battery = 1.8V
Current in one of the 3 ohms resistors = 0.6 A
I hope it helps
A student dips a strip of metal into a liquid. Which is evidence that only a physical change has occurred?
Answer:
not sure if this is correct but it is what i know
The metal bends more easily. The metal changes color. The metal gives off light. The metal gives off heat.
Explanation:
Click on the boxes below to indicate the number of electrons or protons in each labeled position for a zinc atom (z=30, a=65). Please carefully note the specific information requested for the nucleus by the letter designation.
Answer:
A 35
B 2
C 8
D 18
E 2
Explanation:
The number of electrons in the positions of the Zn atom, A, B, C, D and E are 30, 2, 8, 18 and 2 respectively.
What is meant by electronic configuration ?The arrangement of electrons within the orbitals of an atom is known as its electronic configuration.
Here,
The atomic number, which is equal to the number of protons in every neutral atom, is made up of a constant number of electrons in each neutral atom.
The atomic number of an atom is represented by the letter Z.
The mass number of an atom is the sum of the number of protons and neutrons, which are together known as the nucleons, within the nucleus. It is represented by the letter A.
The atomic number of Zinc is given,
Z = 30
From the figure, the electronic configuration can be represented as,
A = 30
which is the total number of electrons in Zn atom.
B = 2
which is the innermost orbital.
C = 8
D = 18
E = 2
Hence,
The number of electrons in the positions of the Zn atom, A, B, C, D and E are 30, 2, 8, 18 and 2 respectively.
To learn more about electronic configuration, click:
https://brainly.com/question/29757010
#SPJ3
can someone help m e
Answer:
A.when the distance is very close from the source
Explanation:
Answerwhen the distance is very close from the source
Explanation: A
hi:) is question 6 correct?
-- When you see the words "uniform speed", that means the car's speed is not changing.
-- Right under those words in the picture, there's a note to remind you that "uniform speed" also means "acceleration is zero".
-- The whole key to this question is to find out if you remember that acceleration and net force always go together.
.==> If there's net force, then there's acceleration.
.==> If there's acceleration, then there's net force.
.==> If there's NO net force then there's NO acceleration.
.==> If there's no acceleration, then there's no net force.
-- In this picture, there's no acceleration, so there's no net force.
-- The driving force on the car is 2000N forward.
-- But the car's speed is not changing, so the net force on the car must be zero.
-- So that 'resisting' force pulling the car backwards must be 2000N. Then the net force on the car adds up to zero.
-- If the resisting force pulling the car backwards is not zero, then the net force on the car would not be zero, and the car's speed would be changing.
What caused the mistake that led to the destruction of the Mar's rover?
Answer:
Metric Math Mistake Muffed Mars Meteorology Mission. 1999: A disaster investigation board reports that NASA's Mars Climate Orbiter burned up in the Martian atmosphere because engineers failed to convert units from English to metric
Explanation:
hope this helps =)
Remembering the Battle of Bunker Hill what did general Howe and his troops do
Answer:
General Howe and the British regrouped after losing the hill.
Explanation:
British forces marched to Breed's Hill on 17 June under the order of Major General William Howe. When the British Army marched in waves toward the Americans, Colonel William Prescott issued orders to avoid the fire until British troops came to clear sight in an attempt to protect the dwindling supply of ammunition to the Americans. Many British soldiers have been killed or maimed; the remainder has withdrawn down the hill. In a second wave, the British stormed the hill once again but met with the same fate. So they withdrew again, suffering a large number of casualties. Eventually the British took the hill in the third attempt but at a great cost of casualties.
What is a good analogy for potential energy in a circuit?
Answer: find the answer in the explanation
Explanation: The potential energy in a circuit between two points is the workdone in taking units positive charge from one point to the other in the circuit. Its S.I unit is Joule.
Because voltage of a battery or cell in a circuit is the potential energy difference across its terminal
The potential energy difference between two points is one volt, if the workdone in taking one Coulomb of positive charge from one point to the other is one Joule.
I am literally so confused on what the question is asking halp :(
Answer: B
Explanation: Distance/Time but if u want it easier its Velocity=Distance/Time or (Final Velocity -Starting Velocity)/Time
