Answer:
a
Explanation:
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Physics is confusing :(
Answer:
30's-40's
Explanation:
Plz Help 100 points
Cool air moves from an air conditioning unit to the rest of a room in a process called ____________.
Explanation:
Ventilation
Please answer the question
If an object weighs 20 N and is sitting on the floor without moving, what must be the normal force of the floor acting on the box?
20 N up
20 N down
10 N up
10 N down
Answer:
20 N up
Explanation:
Since the object on the floor is sitting still. Based on Newton's law of force. Objects must have equal reaction and force against each other for still objects. So the answer is 20 N up. Since the force are equal on both sides making the object not moving.
in determining the percentage purity of an impure NaCo3 for 4.2g of the impure was place in measuring cylinder to work up to 1000cm . the resultant solution is neutralize by 0.092m of 20.40cm3 Hcl in lab [ na=23,o= 16, c=12, h=1, cl=35-5]
hint: percentage purity =mass pure substance ×100
mass concentrate : impure substance??
[tex] {?}^{2} [/tex]
[tex] \binom{}{3} [/tex]
Answer:
C
Explanation:
I guess...
Sorry if it's wrong
what is the velocity of a plane that traveled 5000 miles north followed by 10000 miles north in 20 miles?
Answer:
potential energy
Explanation:
potential energy
Chemical energy, the energy stored in chemical bonds, is thus considered a form of potential energy. Some everyday examples of potential energy include the energy of water held behind a dam, or of a person about to skydive out of an airplane.
The velocity of a plane that traveled 5000 miles north followed by 10000 miles north in 20 hours would be 750 miles/hour.
What is Velocity?The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.
The mathematical expression for velocity is given by
velocity= total displacement/Total time
The total displacement of the plane = 5000 miles +10000 miles
=15000 miles
velocity = displacement/Time
velocity =15000/20 hours
=750 miles/hour
Thus, the velocity of the plane would be 750 miles/hour.
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Your question seems incomplete, the complete question is,
what is the velocity of a plane that traveled 5000 miles north followed by 10000 miles north in 20 hours?
The mass of this astronaut on the moon is 84kg. If the astronaut is on the moon for 3 weeks then returns home, his mass will be (blank) kg ?
Answer:
84kg
Explanation:
If the mass of an astronaut in on the moon is 84kg on the moon. After the 3weeks in returning home, his weight will not change. The mass of the astronaut will remain the same which is 84kg. This is so because the acceleration due to gravity experienced by the body remains the same both in the earth and in moon.
Two weeks ago, a new moon occurred. If
someone looked at the night sky tonight, what could they expect to see?
Answer:
Full moon would be seen.
Explanation:
The moon is the natural planet of the earth, which orbits the earth and thus the Sun. It takes 29.5 days for a complete revolution, passing from one phase to another in the process.
Whenever a new moon is observed, it would take 14 days i.e 2 weeks before it turns to a full moon. Thus with respect to the given question, a full moon would be seen.
it become easier to carry a load in a wheel barrow when the load is shift towards its wheel give reason
A cheetah 325 m North in 30 minutes. What was the cheetah's speed in km/hr?
Answer:
if 325 m ÷ 30
Explanation:
if 325 m ÷30 min then the answer would be 10.8 km /hour
When does The mass of an object change
O A. it changes shape
O B. it loses a piece hs
O C. it gets hotter
O D. it gets cooler
Answer:
B. when it loses a piece
Explanation: it likely gets lighter
How long does it take sound to travel 3525 meters (speed of sound is 330 m/s)?
A sports car has a mass of 1,460kg and accelerates at 2.04 meters per second squared. What is the magnitude of the force acting on the sports car?
Answer:
The answer is 2978.4 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × accelerationFrom the question
mass = 1,460kg
acceleration = 2.04 m/s²
We have
force = 1460 × 2.04
We have the final answer as
2978.4 NHope this helps you
At what velocity would a 5.0 kg dog have to run to have the same
momentum as a 30 kg pig walking at 3.0 m/s?
Answer:
The velocity with which the 5.0 kg dog has to run to have the same momentum as the 30 kg pig walking at 3.0 m/s is 18 m/s
Explanation:
Given that the mass of the dog = 5.0 kg
The mass of the pig = 30 kg
The speed with which the pig is walking = 3.0 m/s
We have that linear momentum = Mass × Velocity
Therefore, the momentum of the pig, m₁ = 30 kg × 3.0 m/s = 90 kg·m/s
m₁ = 90 kg·m/s
The momentum of the dog m₂ = Mass of the dog × Velocity of the dog
Given that m₁ is to be equal to m₂, we have;
m₁ = 90 kg·m/s = m₂ = Mass of the dog × Velocity of the dog
90 kg·m/s = m₂ = 5.0 kg × Velocity of the dog
m₂ = 5.0 kg × Velocity of the dog = 90 kg·m/s
5.0 kg × Velocity of the dog = 90 kg·m/s
Velocity of the dog = 90 kg·m/s/(5.0 kg) = 18 m/s
The velocity with which the 5.0 kg dog has to run to have the same momentum as the 30 kg pig walking at 3.0 m/s = 18 m/s.
PLESSE HELP ASAP :))))
a steel ball of mass 0.1 kg falls from a height of 1.8metres
Please answer correctly.
helppp plzzz
Urgent!!!!
Answer:
Gamma rays are mostly used in the radiotherapy/ radiooncology to treat cancer. They can also be used to spot tumours. Gamma rays can kill living cells and damage malignant tumor
Which property of air makes it effective in protecting firefighters?
The property of air which makes it effective in protecting firefighters is that it is a poor thermal conductor.
What is air?We define air as a mixture of gasses. We know that there a re several gases that are known to compose air and among these are oxygen, carbon dioxide, noble gasses and nitrogen.
We know that air is a poor conductor of heat. As such, air does not heat up quite easily and this would help to protect the fireman from getting burnt since air does not easily allow heat to pass through it as it were, this is why the firefighters depend on the insulative property of air.
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A ferry is crossing a river. The ferry is
headed due north with a speed of 2.6 m/s
relative to the water and the river’s velocity
is 4.4 m/s to the east.
a) What is magnitude of the boat’s velocity relative to Earth?
Answer in units of m/s
b) Find the direction in which the ferry is
moving (measured from due east, with counterclockwise positive).
Answer in units of ◦
.
Answer:
a. 5.1 m/s b. 149.42°
Explanation:
a. Velocity of boat relative to earth, V = velocity of boat relative to river, V'+ velocity of river relative to earth, v.
We add these vectorially.
Since velocity of boat relative to river is 2.6 m/s due north and velocity of river relative to earth is 4.4 m/s due east, we apply Pythagoras' theorem and add them together since both velocities are perpendicular to each other.
So, V² = V'² + v² = (2.6 m/s)² + (4.4 m/s)² = 6.76 (m/s)² + 19.36 (m/s)² = 26.12 (m/s)²
V = √[26.12 (m/s)²]
V = 5.1 m/s
b. Since the relative velocities of the ferry relative to the water and the velocity of the river relative to the earth are the components of the velocity of the ferry relative to the earth, the y - component being the velocity of the ferry relative to the earth since it is due north, and the x- component being the velocity of the river relative to the earth since it is due east. So, we have that
tanФ = y - component/x - component = V'/v where Ф is the angle between V and the west direction.
tanФ = V'/v
tanФ = 2.6 m/s ÷ 4.4 m/s
tanФ = 0.5909
Ф = tan⁻¹(0.5909)
Ф = 30.58°
So, the angle measured from due east with counterclockwise direction positive is 180° - Ф = 180° - 30.58° = 149.42°
Name 2 types of electric circuits based on their connection pattern
Answer:
When there are two or more electrical devices in a circuit with an energy source, there are a couple of basic ways by which we connect them. They can either be connected in series or parallel
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Series Circuit:-A series circuit has only one path for electricity to flow from one point to another. The amount of electricity in the circuit is consistent throughout any component in the circuit. When electricity flows through a series circuit, its rate of flow (speed) will never fluctuate. The total resistance of a series circuit equals the sum of individual resistances. The more resistors that a series circuit has, the more difficult it is for electrons to flow.
Parallel circuit:-A parallel circuit has multiple paths for electricity to flow from one point to another. According to website All About Circuits, “all components are connected between the same set of electrically common points.” Often, resistors and sources will be connected between two sets of electrically common points. In a parallel circuit, electricity can flow in multiple directions horizontally and vertically. The components of a parallel circuit will have the same voltage across their ends and will have identical polarities.
FOLLOW ME ♥️Express the number in scientific notation: -8,675,300.0
Answer:
It would be -8.6753 x 10 to the 6th power
Explanation
In a cinema theatre, why do we normally not hear echoes even though the sounds are loud?
Answer:
An echo is formed as a result of reflection of the original sound which returns to the listener. You might have experienced Echo in an EMPTY ROOM but no echo is produced after the room is occupied. To avoid echo from being produced the echo has to be absorbed.
Explanation:
Find the direction of the sum of
these two vectors:
12.0 m
45.0°
9.66 m. A
m A,
Answer:
82.2
Explanation:
A mover's dolly is used to pull a 115 kg refrigerator up a ramp
into a house. The ramp is 2.10 m long and rises 0.850 m. The
mover exerts a force of 496 N up the ramp. How much work is
spent overcoming friction?
Answer:
84 J
Explanation:
Work by mover:
W = Fd
W = 496 J (2.1 m)
W = 1042 J
Work by dolly and ramp:
W = Fd
W = (mg)d
W = 115 kg (9.8 m/s/s) (0.85 m)
W = 958 J
1042 J - 958 J
= 84 J
The amount of work spent in overcoming friction is 83.65 J.
From the question,
The amount of work spent in overcoming friction = work done by the mover-potential energy of the refrigerator.
This is expressed mathematically as,
W' = Fd-mgh................... Equation 1
Where W' = work spent against friction, F = force applied, d = distance, m = mass of the refrigerator, g = acceleration due to gravity, h = height.
From the question,
Given: F = 496 N, d = 2.10 m, m = 115 kg, h = 0.85 m
Constant: g = 9.8 m/s².
Substitute these values into equation 1
W' = 496(2.1)-(115×9.8×0.85)
W' = 1041.6-957.95
W' = 83.65 J.
Hence, the amount of work spent in overcoming friction is 83.65 J
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A 2 kg object is moving at a constant velocity of 15 m/s. What is its acceleration?
Answer:
The acceleration of the object is 0 m/s^2.
Explanation:
To solve this problem, we must remember that acceleration is equal to the change in velocity per unit time. Since we are given that the velocity is constant, this means it is unchanging, and the acceleration is therefore zero.
Hope this helps!
Which event in the “The Medicine Bag” is most symbolic of Martin beginning to connect with his Sioux heritage?
Martin brings his friends home to meet Grandpa.
Martin chases the dogs away from Grandpa.
Martin finds a leather pouch around Grandpa’s neck.
Martin finds money in Grandpa’s boots.
Answer:
A- Martin brings his friends home to meet grandpa.
Explanation:
took the test.
Answer:
A
Explanation:
on edge :)
What is
0.02204 in scientific notation
Answer:
2.204x10^2 -2 = 0.02204 in scientific notation.
Please someone answer, I will mark them who answers as brainliest,
How much energy is needed to heat 100 kg of paraffin from 10 degree Celsius to 30 degree Celsius. The specific heat capacity of paraffin is. 2200 unit.
Answer:
40,000J
Explanation:
The heat energy required to raise the temperature of unit mass of substance through unit degree is called specific heat of substance . As given 2000J energy is needed to heat 1 kg of paraffin through 1
o
C, therefore specific heat of paraffin will be 2000J/kg−
o
C.
Now, heat energy required to raise the temperature of mass m of substance (specific heat c) through Δt is given by ,
Q=mcΔt,
Given: m=10kg,Δt=2
o
C,c=2000J/kg−
o
C
Q=10×2000×2=40,000J
Experiment with the catapult by changing the amount of energy used to pull the spoon down. When you pull down a small amount and release the marshmallow, what happens? Record your observations. When you pull down a large amount and release the marshmallow, what happens?
Answer:
when The spoon is pulled down with a small amount of energy : short distance travelled by Marsh mallow
When the spoon is pulled down with a higher amount of energy : Long distance travelled by Marshmallow
Explanation:
when The spoon is pulled down with a small amount of energy :
After the release of the spoon the Marshmallow travels a relatively short distance because the acceleration is < mass of the mass of the Marshmallow
F = ma. hence a = F/m where a < m
When the spoon is pulled down with a higher amount of energy
After the release of the spoon the marshmallow travels a relatively long distance when compared to the application of small amount of energy
mechanical advantage of a second class lever is always greater than one why? give reason
Answer:
It is because the load is in between fulcrum and effort making a longer effort arm than the load arm resulting to multiplication of force and a mechanical advantage of greater than 1.
Explanation:
The distance from the fulcrum to the effort is the effort arm where as the distance from the fulcrum to the load is the load arm.
The first class lever has a mechanical advantage that varies per the position of the load with respect to effort position from the fulcrum. They have the fulcrum at the middle. For example, a beam balance and a pliers. The formula to remember is FLE for easy categorization of the lever classes.
The second class lever , the load is at the middle.For example a wheel barrow and a bottle opener. In this class, the effort arm is longer than the load arm.The effort is force multiplication making the mechanical advantage to be greater than 1.
The third class of lever has effort in the middle.For example a spade or a knife.In this class effort arm is shorter than the load arm, causing change in direction of force. The effect is a mechanical advantage less than 1.