Answer:
-322.64 J
Explanation:
75 N * cos 125 * 7.5 = -322.64 J
A wave with a frequency of 80 Hz travels through rubber with a wavelength of 7.0 m. What is the velocity of the wave?
Answer:
560 m/s
Explanation:
Given,
Frequency ( f ) = 80 hz
Wavelength ( λ ) = 7.0 m = 7m
To find : Velocity ( v )
Formula : -
v = f λ
v = 80 x 7
v = 560 m/s
Hence, the velocity of the wave is 560 m/s.
The magnitude of a force acting on an object is equal to the amount of change in momentum divide by ?
Answer:
time taken.
Explanation:
F = ma
F = m × (v - u) / t
F = mv - mu / t
mv - mu = change in momentum
Help please
Identify three different alloys in your home. Describe how each alloy is used and why the properties of the alloy make it suitable for that application.
Three different alloys used in home are brass, bronze and copper. Brass and bronze are used for utensils and copper is used in the electrical circuits.
What are alloys?Alloys are the homogeneous mixture of metal mixed with metal or non metal. These alloys can't be separated by physical methods.
The alloy brass and bronze are used for utensils and copper is used in the electrical circuits.
The properties of the alloys make it suitable for that application is the electrical conductivity and their melting point.
Brass and Bronze are bad conductors of electricity. On the other side, copper is used in electrical circuits.
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Please help if you know
This question involves the concepts of induced emf and magnetic field.
The wire has to move at a speed of "20 m/s".
Speed of WireThe emf induced in a current carrying conductor when it passes through a magnetic field is given by the following formula:
[tex]E = vBl\\\\v=\frac{E}{Bl}[/tex]
where,
v = speed = ?E = induced emf = 10 voltsB = magnetic field = 2.5 Tl = length of wire = 0.2 mTherefore,
[tex]v=\frac{10\ volts}{(2.5\ T)(0.2\ m)}[/tex]
v = 20 m/s
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Which statement below is
INCORRECT about volume?
A. Volume is the amount of space that an object
occupies.
B. The volume of an object is the same as the
weight of that object.
C. Volume can be measured in cubic
centimeters.
D. Volume is calculated using a formula: Volume
= length x width x height
Answer:
B. The volume of an object is the same as the
weight of that object.
Explanation:
Every thing else is right and that one is wrong.
Answer:
B. The volume of an object is the same as the
weight of that object.
Explanation:
i hope it helps
A student with a mass of 65.5 kg runs up a flight of 18 stairs. Each of the steps has a height of 16.5 cm. The student was able to reach the top of the stairs in 2.57 s while climbing it 1 stair at a time.
1. Determine the student’s body power
2. If the student changed the number of steps taken in each step (i.e. 2 at a time OR 3 at a time) but nothing else changed, would this change the power of the student? Explain.
3. A Big Mac meal from McDonalds has 4 853 440 J of energy (1160 calories!). Using your answer from number 1, determine how long it would take for you to convert all the energy in a Big Mac meal (if only running stairs at the same rate). Express your answer in minutes.
The power developed by the student is 756.9 J/s and remains the same if the student takes the same time to climb the stairs when climbing it in two's and three's.
What is power?Power is the rate at work is done.
Power = work done/timework done = mass × acceleration due to gravity × heightWork done = 65.5 × 10 × (18 × 0.165) = 1945.35 J
Power = 1945.35/2.57 = 756.9 J/s
If the student climbed the steps in two or three at a time, the power does not change if the time remains the same.
Time required = Energy/ powerThe time required to convert the Big Mac meal from McDonalds = 4 853 440/756.9
Time required = 6412.26 seconds
Therefore, from the power developed by the student, it will take him 6412.26 seconds to convert all the energy in a Big Mac meal.
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prove that density of 5l of water is 1000
Density can be found when mass and volume is known. The density of 5 liter of water is 1000kg/m³.
What is density?The density ρ of any substance is the ratio of mass m and its volume V.
ρ = m/V
Given is the mass of water as 5 kg and the volume is 5 liter.
as, 1 L = 10−³m³
So, 5 L = 5×10−³m³
Then, density would be
ρ = 5kg / 5×10−³m³
ρ = 1000 kg/m³
Thus, the density of 5l of water is 1000kg/m³.
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A sled of mass 100. kg decelerates at 0.40 m/s² while coasting over the ice. Draw the free body diagram.
What is the "slowing" force of friction due to ice?
The slowing force of friction due to ice on the given sled on the ice is determined as 40 N.
Slowing force of friction due to ice
The slowing force of friction due to ice can be determined by using Newton's second law of motion as follows;
F = ma
where;
m is mass a is accelerationF = 100 x 0.4
F = 40 N
Thus, the slowing force of friction due to ice on the given sled on the ice is determined as 40 N.
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can you write the definition of rest and a motion.
Answer:
Rest: cease work or movement in order to relax, sleep, or recover strength.
Motion: the action or process of moving or being moved.
physics 12
physics geniuses where r u need help!!!
------------
pls also check other questions!
Answer:
Eddy Currents
Explanation:
Eddy currents are produced when a metal is moving through a magnetic field
I AM SO SORRY THIS TIME I PUT IT LOL
Answer:
a Internal core
b The lower mantle
c Butter dough
d Earth rocks
A dolphin accelerates at -1.77m/s^2 for 3.33s and ends with a velocity of -8.77m/s. What is the displacement of the dolphin in that time
Answer:
-19.39
Explanation:
The displacement of the dolphin in that time will be34.2826m.
To find the displacement of the dolphin, we can use the equations of motion. The displacement can be calculated using the following equation:
d = v initial(t) + 1/2at²
We are given that,
Acceleration (a) = -1.77 m/s² (negative because it's decelerating)
Time (t) = 3.33 s
Final velocity (final v final) = -8.77 m/s
To find the initial velocity, we can use another kinematic equation:
final= Vinitial + Vfinal =v initial +at
Now, plug in the values:
v initial= − 8.77m/s − ( −1.77m/s²)× 3.33s
v initial=−8.77m/s−(−1.77m/s²)×3.33s
v initial =- 2.8769m/s
Now that we have the initial velocity, we can find the displacement using the first equation:
d = v initial(t) + 1/2 at²
d = - 2.8769m/s × 3.33 s + 1/2(-1.77 m/s²) × 3.33s
d = - 34.2826m
The displacement of the dolphin in that time is - 34.2826m. The negative sign indicates that the displacement is in the opposite direction of the initial velocity.
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A boat has a mass of 54,000 kg. The boat is accelerating at 0.4 m/s2. What is the net force acting on the boat?'
Answer:
21.6 kN
Explanation:
F = m * a
F = 54 000 * .4 = 21600 N
Answer:54,000 N
Explanation:
A pharmacist works with a 1.75 m solution of sodium bromide (nabr) and water. the volume of the solution is 84.0 milliliters. if the pharmacist dilutes the solution to 1.00 m, what is the volume of the new solution? express your answer to three significant figures. the volume of the new solution is milliliters.
The volume of the diluted (i.e the new) solution given the data is 147 mL
Data obtained from the question Molarity of stock solution (M₁) = 1.85 MVolume of stock solution (V₁) = 84 mL Molarity of diluted solution (M₂) = 1 MVolume of diluted solution (V₂) = ?How to determine the volume of diluted solutionM₁V₁ = M₂V₂
1.75 × 84 = 1 × V₂
V₂ = 147 mL
Thus, the volume of the new solution is 147 mL
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A 16kg dog is running 4m/s. Find its kinetic energy.
4J
64 J
128 J
256 J
Answer:
128J
Explanation:
K.E = MV² ÷ 2
K.E = 16 × 4² ÷ 2
K.E = 16 × 16 ÷ 2
K.E = 256 ÷ 2
K.E = 128J
:. it's kinetic energy is 128Joules(J)
What type of galaxy is this?
Answer:
Barred Spiral.
A trainer using fish to reward a dolphin that jumps through a hoop is an example of
I need help with my homework please? I will give a lot of points and a brainlist.
Answer:
1. False
some metals are ferromagnetic
2.True
3. True
4. True
5. False
The strength of electromagnetic can be increased by increasing the number of wire around it
#1
FalseVery few like Fe,Ni ,Co are ferromagnetic.
Most are para magneticSome are dia magnetic#2
True
#3
True
#4
It's Orsterd experiment conclusion
True#5
FalseBecause
[tex]\sf B=\mu_o nI[/tex]
If you decrease no of turns magnetic force decreases
Heredity has an impact on personal health, but environmental factors are important as well. please select the best answer from the choices provided t f
Heredity has an impact on personal health, but environmental factors are important as well, the given statement is True.
Heredity represents the transfer of traits from one generation to the next generation. It has an impact on personal heath as the health condition of an individual is goverend by the protein products that control the growth and development of the organism.
For instance, the presence of hazardous substances in air, water, and soil that cause pollution directly have harmful impact on the health of individuals.
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Describe such a motion from everyday experience?
Answer:
I drive my car at a speed of 30m/s is speed
I drive my car at a speed of 30m/s northward is velocity
When two forces act in opposite directions, then net force acting due to two
forces
a. sum of two factors
b. difference between two factors
c. both of these
d. none of these
Answer:
option b
Explanation:
when the two forces act in opposite directions there effective magnitude decreases.
Answer:
b. difference between two factors
Explanation:
When two forces act in the opposite directions, the net force is the difference between them.
A 197 g object apparently loses 34 g when fully submerged in a liquid of density 2.3 g/cm3. What is the density of the object
Answer:
13.33 gm/cm^3
Explanation:
Displacement of liquid =
34 gm / 2.3 gm/cm^3 = 14.783 cm^3
so the VOLUME of the object is 14.783 cm^3
density = 197 gm / 14.783 cm^3 = 13.33 gm/cm^3
Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
Decreasing temperatures
Explanation:
Indicators of climate change :
Increasing temperaturesMelting of ice capsOcean acidificationRise in sea levelHence, option 1 which gives decrease in temperature is not a climate change indicator.
Answer:
Decreasing tempertures
Explanation:
Consider an object launched upward against the force of
gravity. What is the velocity of the object at the moment it
reaches its the maximum height?
Answer:
Zero
Explanation:
When it reaches max height, it stops and begins to fall back down....at this point the velocity = 0
What SI unit would you use to express the volume of a textbook
Answer:
Probably cubic centimeters cm^3
Explanation:
Ellis always sticks to just one drink when going out with friends. what is the only option if ellis wants to stick to one standard serving of alcohol? a. a 16-ounce bottle of beer with 4.5% alcohol b. a 5-ounce glass of wine with 14% alcohol c. a 1.5 ounce shot of liquor with 40% alcohol d. a 12-ounce can of beer with 5.5% alcohol
The only option if Ellis wants to stick to one standard serving of alcohol is a 1.5 ounce shot of liquor with 40% alcohol.
What is standard serving of alcohol?
In the United States, one standard serving of alcohol contains roughly 14 grams of pure alcohol, which is found in:
12 ounces of regular beer, which is usually about 5% alcohol. 5 ounces of wine, which is typically about 12% alcohol. 1.5 ounces of distilled spirits, which is about 40% alcohol.Thus, the only option if Ellis wants to stick to one standard serving of alcohol is a 1.5 ounce shot of liquor with 40% alcohol.
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Which statements about electric field lines are correct? Check all that apply.
They point toward a positive charge.
0 They point toward a negative charge.
5 They poipt away from a positive charge.
D They point away from a negative charge.
0 They cross over one another between charges.
They never cross.
The correct statements about electric field lines are they point away from a positive charge, they point toward a negative charge and they never cross.
What are electric field lines?An electric field line is an imaginary line drawn through a region of empty space so that its tangent at any point on the line represents the direction of the electric field vector.
The electric field lines starts from the positive charge and terminates at the negative charge. These lines never intersect each other.
Thus, the correct statements about electric field lines are they point away from a positive charge, they point toward a negative charge and they never cross.
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A particular spherical-shaped fruit has a spherical seed, and the rest of the fruit is edible. The radius of the fruit is 3 times the radius of the seed. It is known that the seed has a volume of 100 cubic centimeters. What is the volume of edible fruit rounded to the nearest cubic centimeter? cubic centimeters.
Answer:
2600 cubic centimeters
Explanation:
Volume of the edible fruit is equal to :
⇒ Volume (fruit) - Volume (seed)
⇒ 4/3π(3r)³ - 4/3πr³
⇒ 27 x 4/3πr³ - 4/3πr³
⇒ 100 (27 - 1)
⇒ 2600 cubic centimeters
The volume of the edible fruit, rounded to the nearest cubic centimeter, is approximately 1188 cubic centimeters.
Given that the volume of the seed is 100 cubic centimeters, we can use the formula for the volume of a sphere to relate the radius and volume:
V(seed) = (4/3)πr³
100 = (4/3)πr³
Next, we can determine the radius of the fruit by multiplying the radius of the seed by 3:
R(fruit) = 3r
V(fruit) = (4/3)π(R(fruit)³ - r³)
V(fruit) = (4/3)π((3r)³ - r³)
V(fruit) = (4/3)π(27r³ - r³)
V(fruit) = (4/3)π(26r)
Now, substitute the value of r from the first equation into the expression for V(fruit):
V(fruit) = (4/3)π(26 × ∛(100/(4/3)π))
V(fruit) = 1188 cubic centimeters
Therefore, the volume of the edible fruit, rounded to the nearest cubic centimeter, is approximately 1188 cubic centimeters.
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______________ are chemicals in the body affecting how you feel.
A.
Hormones
B.
Emotions
C.
Calories
D.
Memories
Answer:
emotions
Explanation:
emotions are how you feel and can happen any time
Hope it helps <333
Answer:
emotions affect your body and how you feel
A man lowers an object of mass 12 kg from a height of 0.5m to the floor. What is the work done by him?
Answer:
Work = Force × distance
= m × g × d
= 12 × 9.8 × 0.5
= 58.8 N
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