Answer:
O N
Explanation:
Upthrust = Volume of object * density of fluid * acceleration due to gravity
Upthrust = 4.0 m3 * 1000 kg/m3 * 10 m/^2
Upthrust = 40, 000 N
Upthrust = Weight in air - Weight in water
Weight in air = 40,000 N
Weight in water = Weight in air - Upthrust
Weight in water = 40,000 N - 40,000 N
Weight in water = 0 N
Simplify 45÷3+2×8-12+42
Answer:
Explanation is in the picture and the answer is 16
please tell what is energy
Answer:
the capacity to do work is called energy
in the circuit diagram below on voltmeter V2 is 12V and the reading on ammeter A1 is 2A
calculate the amount of charge that flows through ammeter A1 in 120 second
Answer:
q = 240 C
Explanation:
The current passing through a circuit is defined as the amount of charge passing through that circuit per unit of time. Hence, the current can be calculated through the following formula:
[tex]I = \frac{q}{t}\\\\q = It[/tex]
where,
q = total amount of charge = ?
I = current = 2 A
t = time = 120 s
Therefore,
[tex]q = (2\ A)(120\ s)\\[/tex]
q = 240 C
Please I really need this !! Potassium loses electrons when it reacts with oxygen. Which statement is true of potassium in this reaction?
A. It reduces.
B. It undergoes synthesis.
C. It undergoes redox.
D. It oxidizes
write your opinion about achievement made by during rana rule
Answer:
Your opinion about achievement made by during rana rule
Explanation:
April Fools !
How does the strength of a magnetic field around a wire vary?
Answer:
By pointing one's right thumb along the direction of the current, the direction of the magnetic field can by found by curving one's fingers around the wire. The strength of the magnetic field depends on the current I in the wire and r, the distance from the wire.
1. Find the current in a circuit where the voltage is 9 volts and the resistance is 4 ohms.
a. 36 amps
b. 2.25 amps
c. 2 amps
d. 18 amps
2. Find the current in a circuit where the voltage is 120 volts and the resistance is 4 ohms.
a. 3 amps
b. 240 amps
c. 30 amps
d. 480 amps
3. Find the voltage in a circuit where the current is 10 amps and the resistance is 12 ohms.
a. 1.2 volts
b. 60 volts
c. 0.83 volts
d. 120 volts
4. Find the voltage in a circuit where the current is 3 amps and the resistance is 3 ohms.
a. 1 volt
b. 9 volts
c. 0 volts
d. 120 volts
5. Find the resistance in a circuit where the current is 10 amps and the voltage is 120 volts.
a. 130 ohms
b. 1200 ohms
c. 12 ohms
d. 110 ohms
6. Find the resistance in a circuit where the current is 20 amps and the voltage is 120 volts.
a. 6 ohms
b. 12 ohms
c. 240 ohms
d. 100 ohms
A catapult with a just-ejected ball flying through the air. A catapult's lever holds a cannonball. The lever is attached to a tightly held rope. When the rope is released, the lever springs forward and launches the cannonball. When the rope is held tightly, which form of energy does it possess? thermal nuclear gravitational elastic
Answer:
he string has POTENTIAL ELASTIC energy
Explanation:
he catapult is a very good example of energy transformations.
Initially when the string is taut it has an elastic potential energy, when releasing the lever it is transformed into cinetic energy in the ball until it shoots out.
Consequently the string has POTENTIAL ELASTIC energy
Answer:
The answer is elastic
TRUST ME
Explanation:
How do you get DC current and AC current? from a generator?
Answer:
They do that by converting rotating mechanical energy into electrical power. Portable generators use an engine—typically running on gasoline, diesel, or propane, to turn an alternator which produces alternating electrical current or AC.
I need help so bad pls pls help
Answer:
I think it is protection
Answer:
I think it might be PROTECTION but i not sure for a fact
Sorry if i get it wrong ;]
Explanation:
Light waves Group of answer choices are not electromagnetic radiation. do not require a medium. can not travel in a vacuum. do not travel in straight lines from the source.
Answer:
do not require a medium
Explanation:
Light waves can be regarded as electromagnetic waves and it transverse in nature, no medium material is required to pass through. Light wave can travel through vacuum and it's ray can travel in straight lines even from point source. Light convey energy in perpendicular direction to electric field as well as magnetic field.
what is the magnitude of vector A?
what does heat trapped by pollution cause?
A. Acid rain
B. Decomposition
C. Greenhouse effect
Answer:
C. Greenhouse Effect
Explanation:
The greenhouse effect is caused by heat trapping pollution in the atmosphere.
PLS HELP !!
Which of these must be true for a perfectly elastic collision?
Select one:
A: Kinetic energy is conserved
B: The velocity of the first object will not transfer to the second object
C: The objects will stick together
D: The masses must be equal
Answer:
D.
Explanation:
the masses must be equal
If a chemical reaction has a AH value of -125 kJ, it would be considered what?
A. an exothermic reaction
B. a reaction that absorbs energy
C. an endothermic reaction
D. A reaction that probably gets cold
exothermic
Explanation:
negative means it's losing energy
Does anyone know the answer to all of these questions
Answer:
i don't understand the hw
Write 3 rules that describe the possible behaviors that occur when objects with different charges are brought close together
Explanation:
1. attract
2.repel
3. no effect
A high diver dives off a platform and strikes the water 1.857 seconds later. Ignoring air resistance, how fast is he traveling as he strikes the water in m/s?
Answer:
The (vertical) speed of the driver as he strikes the water is approximately 18.22 m/s
Explanation:
From the parameters given in the question, we have;
The time after which the driver strikes the water after he drives off a platform, t = 1.857 s
Let 'v' represent the vertical speed of the driver
We can find the vertical speed of the vehicle as it strikes the water as follows;
v = u + g·t
Where;
v = The final vertical velocity of the driver
u = The initial vertical speed of the driver = 0 m/s
g = The acceleration due to gravity ≈ 9.81 m/s²
t = The time of motion = 1.857 seconds
Therefore, we have;
v = 0 + 9.81 m/s² × 1.857 s = 18.21717 m/s
Therefore;
The vertical speed of the driver as he strikes the water, v ≈ 18.22 m/s
HOW TO ANSWER THIS QUESTION PLEASE
Answer:
radioactive decay is a random processuse long tongsExplanation:
Quantum theory has taught us that virtually everything to do with the nature of matter in the universe is a random process. The decay of atomic nuclei is something that makes that randomness "visible" with appropriate instrumentation. As such, the rate of decay will vary over the "short" term. Consequently, it is not surprising to see a variation of a few counts in an activity measurement over a period of a few minutes.
__
Safety with respect to radioactive materials involves staying as far away from them as possible. The use of long tongs for handling would be appropriate.
Answer:
Radioactive decay is a long proxyUse long tongs↔ for safety precautions the scientist should used this upon working with radioactive materials in a laboratory.
A runner of 60kg accelerates at 2.0 m/s at the start of race calculate the force provided from her legs
Answer:
120 kgm/s
Explanation:
Force= mass× acceleration
= 60kg × 2.0m/s
= 120 kgm/s
Research and define pressure, as it relates to air or water pressure.
Answer:
PRESSURE is a force exerted by the substance per unit area on another substance.
The key difference between water pressure and air pressure is that one is made up of water and the other is made up of air. Both air pressure and water pressure are based on and follow the same physical principals.
Explanation:
only a relatively small part of the electromagnetic spectrum is visible. what determines which bands of the electromagnetic spectrum are invisible to humans?
Answer:
hsnzbssj
Explanation:
skibbbbbbbbbbbbibiWhat are two ways fission is used in the real world.
Answer:
germ cleaning
and getting up cooking grease
Explanation:
PLZZZZ HELPPPPPP MEEEEEE!!!!!! ILL GIVE 20 POINTS AND BRAINLIEST!!!
:'(
I am desperate guys.
Answer:
c.
Explanation:
In positron emission, also called positive beta decay (β+-decay), a proton in the parent nucleus decays into a neutron that remains in the daughter nucleus, and the nucleus emits a neutrino and a positron, which is a positive particle like an ordinary electron in mass but of opposite charge.
Does this help? Sorry it's wordy that's just how my teachers taught me :'(
A rock with a mass of 55 kg is on top of a cliff that is 27 m high. Calculate the gravitational potential energy of the rock.
A 14553 J
B. 145.5 J
c. 91.8 J
D. 2.3 J
Answer:
A. 14553 J
Explanation:
GPE (Gravitational Potential Energy) = mgh
m = 55
g = 9.8 m/s²
h = 27
GPE = 55(9.8)(27) = 14553 J
What is the “Food cam” at MIT? What is it for?
Answer:
But in MIT's Media Lab, everyone has a fair shot, thanks to a camera that alerts the lab when there's free food. Called the Foodcam, it features a camera that beams a photo of the leftovers to the entire lab, creators Will Glesnes and Jon Ferguson, tell Tech Insider.
Sound waves travel fastest through
Group of answer choices
water
air
a vacuum
steel
Answer:
Solids: Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air.
Explanation:
Answer:
option number 3
a vaccummm
The ratio of the speed of light in a medium to the speed of light in a vacuum
is called its:
A. angle of incidence
B. Snell's Law
C. angle of refraction
D. refractive index
Answer:D.Refractive Indez
Explanation:
It is usually expressed the other way: the ratio of the speed of light in a vacuum to the speed of light in a medium. In that case, it is called the "index of refraction".
You're going for "refractive index", but you've got the ratio flipped over.
does frequency of the sound affect speed of sound
Answer:
One of the more important properties of sound is that its speed is nearly independent of frequency. ... Therefore, the relationship between f and λ is inverse: The higher the frequency, the shorter the wavelength of a sound wave. The speed of sound can change when sound travels from one medium to another.
What is the formula for Newton's
second law?
Answer:
f=ma
Explanation:
Answer:
F = m * a
Explanation:
2nd law of motion