Answer:
Explanation:
Since the block is at rest in an elevated position, we can assume that it only has potential energy.
U=mgh is the formula for potential energy where U=potential energy, m= mass, g=acceleration due to gravity, and h=height.
Plug in known variables....
U=4kg*9.8m/s^2*20m
U=784 joules of potential energy or letter A.
The velocity of a car increases from 10 km/h to 50 km/h in 5 seconds. What is its acceleration?
Answer:
2.22m/s^2
Explanation:
A reference point allows you to determine the _____________of an object state state speed speed position position dimension
Answer:
Position.
Explanation:
Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point.
This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.
Mathematically, the motion of an object is described in terms of acceleration, time, distance, speed, velocity, displacement, position, etc.
A reference point refers to a location or physical object from which the motion (movement) of another physical object or body can be determined.
For example, a point on a map is considered to be a reference point because it represents the starting point of an object or person in motion.
Hence, a reference point allows you to determine the position an object.
Which of these would have the highest temperature?
ice
water
water vapor
Answer:
Water vapor
Explanation:
Water Vapor has the highest temperature, due to its being in a gas state, and gases usually have very high temperatures, for example steam when you boil pasta.
Hope this helps you! Have a nice day!
Aunt Mary needs to hang a picture in her bedroom. She uses a hammer to drive the nail into the wall. Find the force exerted by the hammer on the nail if the hammer stays in contact with the nail for 0.5s and has an impulse of 25Ns
Answer:
50N
Explanation:
Impulse = Force × Time
25 = Force × 0.5
Force = 25/0.5
= 50N
On a box are the words 12 Volt : 50 mA
What is the resistor in Kilo-Ohm?
Answer:
R = 0.24 kilo-ohm
Explanation:
Given that,
Voltage, V = 12 volt
Current, I = 50 mA = 0.05 A
We need to find the resistance of the resistor. We can find it using Ohm's law. So,
V = IR
[tex]R=\dfrac{V}{I}\\\\R=\dfrac{12}{0.05}\\\\R=240\ \Omega[/tex]
or
R = 0.24 kohm
So, the value of resistance is 0.24 kilo-ohm.
How can I skip class:
A: Fake sick.
B: Have a heating pad on my heat to have a fake fever.
C: Fake barf
D: Act fine until a test the neb sick
Answer:
c gl
Explanation:
::::::::::::::::::::::::
PLEASE HELP WILL GIVE BRAINLIEST (I NEED TWO PICKED) PLZzZZZZ AND THxS
Answer:
A and B
Explanation:
They contain Chlorophyll
They are relatively tall
2.
The IMA of an inclined plane 8m long and 2m high is ______.
16
4
2
8
Answer:
Explanation:
4
please help me i neeed help with all threeas soon as possible thank you
Answer:
4b: comets
5a: supercluster
5b: they just changed 4b's solar system for milky way. I think it is still comets. if not, then just say black holes.
A small motor uses 200 watts to do 4000 joules of work. How much time this take to occur?
I need help with 1-3 and 6-9
its do today need help with all of the questions plzzzzz
Answer:
56767475457345621251461
Explanation:
Answer:
1.C
2.B
3.A
i need a better picture to help with 6-9
Uranium is an element. Which type of matter is uranium?
A. A pure substance
B. A homogeneous mixture
C. A compound
D. A heterogeneous mixture
Uranium is an element. Uranium is a pure substance kind of matter. Thus, the correct option is A.
What is a pure substance?A pure substance is a single type of matter which cannot be separated or divided into other smaller kinds of matter through any kind of physical means or chemical decomposition. A pure substance always has a definite and a constant composition. A mixture is a physical combination which is made up of two or more kinds of pure substances in which each of the substance retains its own chemical identity in the compound.
Uranium is a chemical element with the symbol of U for its representation and the atomic number of 92. Uranium element is a silvery-grey metal in the actinide series of the periodic table of elements. A uranium atom has both 92 protons and 92 electrons, of which 6 of these electrons are valence electrons.
Therefore, the correct option is A.
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Answer:
A
Explanation:
A solar eclipse may occur when:
A. when the moon is 3rd quarter phase
B. when the moon is full
C. when the moon is at 1st quarter phase
D. when the moon is new
equation for power work done and time
Answer:
power can be expressed as P=work/change in time,instead of P=change of energy/change in time because the change of energy is basically the work done.
Answer:
P=W/T....is the answer
5. A bird flies with a speed of 3.5m/s towards the north. Determine the distance the bird flew in 3 minutes.
Answer: I believe it may be 18m/s I apologize if it isn't but have a great day :DDD
Waves are observed passing under a dock. Wave crests are 8.0 meters apart. The time for a complete wave to pass by is 4.0 seconds. The markings on the post submerged in water indicate that the water level fluctuates from a trough at 6.0 meters to a crest at 9.0 meters. Calculate the velocity of the wave.
Answer:
2 m/s
Explanation:
The crest of the wave moves 8 meters in 4 seconds, so its speed is ...
(8 m)/(4 s) = 2 m/s
Answer:
2 m/s is the answer .
Explanation:
#CarryOnLearningFind the magnitude of the sum of two vectors; A is 5 km , and B is 7 , when the angle btween them is 120
Answer: 6.24 km
Explanation:
Given
The magnitude of the first vector(say) [tex]\left | a\right |=5\ km[/tex]
the magnitude of the second vector(say) [tex]\left | b\right |=7\ km[/tex]
the angle between them is [tex]120^{\circ}[/tex]
The resultant vector magnitude is given by
[tex]\left | \vec{R}\right |=\sqrt{a^2+b^2+2ab\cos \theta}[/tex]
[tex]\left | \vec{R}\right |=\sqrt{5^2+7^2+2\times 5\times 7\cdot \cos 120^{\circ}}\\\left | \vec{R}\right |=\sqrt{74-35}=\sqrt{39}\\\left | \vec{R}\right |=6.24\ km[/tex]
PHYSICS physics help me pls!
the question is not clear for me the mass of the word and the pivot the artist as the counterweight of the end we calculate the mass of the counterweight sorry
Answer:
calculate mass of the counterweight?
Explanation:
A volume of 25 milliliters is the same as a volume of ____________________ cubic centimeters.
Answer:
25 cm³
Explanation:
In the conversion of units, we know that are one cubic centimeters (cm³) in a milliliter (mL) .
1 milliliter = 1 cubic centimeter
25 milliliters = 25 cubic centimeters
Therefore, a volume of 25 milliliters is the same as a volume of 25 cubic centimeters.
This ultimately implies that, the volume of an object in milliliters is equivalent to its volume in cubic centimeters.
Someone plz help I’m on a time limit :(
What patterns occur in the Earth-Sun-Moon system that allow us to identify the cause of
eclipses?
Answer:
Earth's rotation and orbit and the Moon's orbit cause observable patterns (Day and night, seasons, phases of the Moon, tides).
PLS ANSWER FAST WILL GIVE BRAINLY!! BUT ONLY IF YOU KNOW!!
Fill in the blank
The atomic number is the same as the number of____in an atom
Anthony walks to the pizza place for lunch. He walks 1km east, and then 1 km east again. What distance did he cover? What was his displacement?
Answer:
Distance covered by Anthony is 3 km. Don't know about displacement though.
1.Coral reefs are endangered by?
a. Climate change b. pollution C. overfishing d. all of the above
Answer:
I'm going to go out on a limb and say D. All of the above
Explanation:
what is the electric potential difference of 5cm from a point charge of -2.0µc
Answer:
V = 360 kV
Explanation:
Given that,
Charge, q = -2µC
We need to find the electric potential difference of 5cm from a point charge.
We know that the formula for the electric potential is given by :
[tex]V=\dfrac{kq}{r}\\\\V=\dfrac{9\times 10^9\times 2\times 10^{-6}}{0.05}\\\\V=360000\ V[/tex]
or
[tex]V=360\ kV[/tex]
So, the electric potential difference is 360 kV.
Which of the following is NOT a correct statement regarding the theory of evolution?
The offspring of a species compete with each other for limited resources.
All organisms in a species are genetically unique.
The offspring of a species with the most favorable traits have the best chance for survival.
All organisms evolve at the same rate.
the answer is "all organisms evolve at the same rate" :)
Answer:
answer is b
Explanation:
What TWO things do all vectors have?
Answer:
Explanation:
orange jump suit n a fat belly
Select the correct answer from each drop-down menu.
Two magnets are placed as shown in the image.
The force of (Attraction or repulsion)
between the poles B and C is (Maximum or minimum)
And the force of (Attraction or repulsion)
between the poles A and D is (maximum or minimum)
Answer:
The force of the (attraction) between the poles B and C is (maximum) and the force of a (attraction) between the poles A and D is (minimum).
Explanation:
a car is traveling 20 m/s. it takes 4 seconds with a 7,500 n force to come to a stop. what is the mass of the car
Answer:
mass equals 375 kg
Explanation:
f=ma
f=7500
a=20
m=f/a
m=7500/20
m=375
1500 kg is the mass of the car.
What is Newton's second law of motion?Newton's second law of motion describes the relationship between an object's mass and the amount of force needed to accelerate it.
Newton's second law is often stated as,
F=ma, which means the force (F) acting on an object is equal to the mass (m) of an object times its acceleration (a).
According to the question,
Mass = 20m/s , Time = 4s , Force = 7500 N
a = Δv/Δt
a = 20m/s / 4s
a = 5 m/s²
If F = ma then,
7500 N = m x 5 m/s²
m = [tex]\frac{7500 N }{ 5m/s^{2} }[/tex]
m = 1500 kg
Therefore,
1500 kg is the mass of the car.
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What will happen to a balloon filled with air when you cool the balloon in ice
Answer:
the volume of balloon decreases by the lower temperature because the gas inside is cool down1. Your car's engine suddenly dies as you're driving 35m/s down the highway. If the sum of friction forces on your car is 7000N and your car weighs 1300kg at what rate will you accelerate to a stop? |
Answer:
Explanation:
Frictional force = 7000 N
mass of car = 1300 kg . Initially car was moving uniformly so no force acting on car at that time . After frictional force acts , it creates deceleration or negative acceleration .
acceleration = force / mass
= - 7000 / 1300
= - 5.38 m / s²