Answer:
P = 15 [W]
Explanation:
Power is defined as the relationship between work over a certain time.
In this way we must calculate the work which is defined as the product of force by distance.
[tex]W=F*d\\W=75*20\\W=1500[J][/tex]
And the power.
[tex]P=W/t\\P=1500/100\\P=15[W][/tex]
Power given in units of watts.
explain why in the construction of a lightning conductor one end is made into a sharp point
Answer:
A lightning conductor is made up of a sharp pointed metal (usually copper metal, as it is a very good conductor) connected directly to the ground. ... The lightning conductor is placed higher than the roof so that if lightning strikes, it strikes the conductor before it can reach the house.
Explanation:
A lightning conductor is made up of a sharp pointed metal (usually copper metal, as it is a very good conductor) connected directly to the ground. ... The lightning conductor is placed higher than the roof so that if lightning strikes, it strikes the conductor before it can reach the house.
A 2.25kg solid sphere has a rotational inertia about its center
• of gravity of 1.52kg.m2. What is the radius of the sphere?
Answer:
r = 1.3m
Explanation:
The moment of inertia of a solid sphere can be expressed using the formula;
I = ⅖ mr²
Where;
I = moment (kgm²)
m = mass of the sphere (kg)
r = rotational radius of the sphere (m)
Based on the provided information in this question, I = 1.52 kgm², m = 2.25 kg, r = ?
1.52 = ⅖ × 2.25 × r²
1.52 = 0.4 × 2.25 × r²
1.52 = 0.9 × r²
1.52 = 0.9r²
r² = 1.52/0.9
r² = 1.688
r² = 1.69
r = √1.69
r = 1.3m
The density of iron is 7.87 g/cm3. If an iron cannonball has a volume of 105 cm3
what is the mass of the ball?
the answer is 0.284 lb/in3
HELP ASAP please.
Determine if each picture is a high or low tide.
Note: only ONE picture can be a high tide and only ONE picture can be a low tide!
Answer:
1st one low tide 2nd high tide
9. A soft drink distibutor drove west 11 km from Minnehaha to Nut Plains. She then turned around and drove back east for 209 km to Dover
What distance did the soft drink dibutor travel
Distance
Answer:
220km
Explanation:
Given parameters:
Distance traveled from Minnehaha to Nut Plains = 11km
Distance traveled to Dover = 209km
Unknown:
The distance the soft drink distributor traveled = ?
Solution:
To solve this problem, we must understand that distance is the total length of path covered in a journey.
So;
Distance = 209km + 11km = 220km
The soft drink distributor covered 220km
An object of mass 8kg is attached to massless string of length 2m and swum with a tangential velocity of 3 what is the tension on the string
Answer:
36 N
Explanation:
If the object of mass, m = 8 kg is swung in a horizontal circle of radius, r = 2m = length of string with tangential velocity v = 3 m/s, the tension in the string is the centripetal force which is T = mv²/r
= 8 kg × (3 m/s)²/2 m
= 4 kg × 9 m/s²
= 36 N
The question is in the photo.
Answer:
Mitochondria (animal) and Chloroplast (plant)
Susie blows up a balloon. First, she places the balloon in a bucket of ice water. She observes the balloon. She then removes the balloon and places it into a bucket of hot water. She observes the balloon again.
1. Explain what Susie will observes when she puts the balloon in ice water.
2. Explain what Susie will observe when she puts the balloon in hot water.
1. When Susie puts the balloon in ice water, she will observe the contraction of the balloon.
2. When Susie puts the balloon in hot water, she will observe the expansion of the balloon.
What is Charles's law of gas?According to Charles' law, assuming the pressure is constant, the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature. French physicist J.-A.-C. Charles initially proposed this empirical relationship.
1. When Susie puts the balloon in ice water, the temperature of the gas inside the balloon will decreases and according to Charles' law its volume also decreases. That's why, she will observe the contraction of the balloon.
2. When Susie puts the balloon in hot water, the temperature of the gas inside the balloon will increases and according to Charles' law its volume also increases. That's why, she will observe the expansion of the balloon.
Learn more about Charles's law here:
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A man walks 2.6 miles east, then turns and walks 6.7 miles north. What is his resultant
vector from start to finish?
Answer:
Yes cause he walks 6.7 miles
The displacement vector of the man is equal to 17.41 miles in the Northeast direction.
What is displacement?The displacement of an object can be defined as the shortest distance between two points. The displacement can be described as a vector quantity because contains both direction and magnitude. The displacement can be positive (+ve), negative, or zero and can change with time.
The distance is the total path traveled and is a scalar quantity as it has only magnitude, and no direction. The distance is always positive (+ve), it can never be equal to zero.
Given, a man moves 2.6 miles along AB in the East and then 6.7 miles North along BC.
The displacement (AC) of the man can be calculated by using Pythagoras' theorem:
AC² = AB² + BC²
AC² = (2.6)² + (6.7)²
AC² = 6.76 +44.89
AC = 17.41 miles
Therefore, the displacement vector of the man is 17.41 miles.
Learn more about displacement, here:
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Characteristics we use to tell the difference between kinds of matter are called___ properties
Answer:
I believe it's called qualitative
Explanation:
If I start with an 30 gram sample of Plutonium-244, how many grams would be left of Plutonium-244 after 1 half life
Answer:
15 g
Explanation:
Given,
Plutonium-244 = 30 g
We have to find the gram of Plutonium-244 left after 1 half-life.
We know that the half-life of a radioactive isotope is constant. The half-life of a Radioactive isotope does not depend on the initial amount of isotope.
Now,
After 1 half-life
Plutonium-244 left = [tex]\dfrac{30}{2}[/tex]
= 15 g
Hence, 15 g of the Plutonium-244 will be left after 1 half-life.
What is included in the units of Velocity that make it different from speed?What is included in the units of Velocity that make it different from speed?
Answer:
Direction
Explanation:
Speed is a measure of the distance covered by a moving object relative to the time it takes. It is a scalar quantity and, hence, measured irrespective of the direction the object is moving.
Velocity, on the other hand, is the speed of a moving object in a particular direction. It is a vector quantity, meaning that the direction of the moving object is important.
Therefore, the difference in the unit of speed and velocity is direction. The direction must be included in the unit of velocity.
...
please halp
Please answer the following 3 questions with a 1 paragraph response:
Why is defense important in the game of basketball? What two ways can you play defense in basketball? What are the differences between the 2 different ways you can choose to play defense?
The two basic defenses in basketball are man-to-man, sometimes referred to as person-to-person in respect for the rise of women's basketball, and zone. Each basic defense has a number of variations.
A physical property is a characteristic of a substance is one that _____.
A.) can be observed by changing it into a different substance
B.) is seen after changing it into a different substance
C.) can be observed without changing it into a different substance
D.) does not involve freezing or boiling the substance
how does the eye control the amount of light entering it?
Answer:
Dilating the pupils.
Answer:
the retina of the eye contains photoreceptor cells that detect the light intensity, whether it is dim or bright, changing shape of iris.
Explanation:
in dim light, the receptors detect the light intensity, and in order to allow us to see more clearly, the radial muscles in iris contract, making the pupil widen(dilate), so more light enters eye.
in case of bright light, he receptors detect the light intensity, and in order to allow us to see more clearly, the circular muscles in iris contract, making the pupil narrow(constrict), so less light enters eye
In a typical golf swing the club is in contact with the ball for about 0.0010 s. If the .045 kg ball experiences a force of 4000 N, what is the final velocity of the golf ball?
Answer:
v = 88.89 [m/s]
Explanation:
To solve this problem we must use the principle of conservation of momentum which tells us that the initial momentum of a body plus the momentum added to that body will be equal to the final momentum of the body.
We must make up the following equation:
[tex]F*t = m*v[/tex]
where:
F = force applied = 4000 [N]
t = time = 0.001 [s]
m = mass = 0.045 [kg]
v = velocity [m/s]
[tex]4000*0.001=0.045*v\\v=88.89[m/s][/tex]
A cyclist travels 1850 m north and then 1200 m south. Find both the distance it has traveled and the magnitude of its displacement.
Answer:
The distance it has traveled is 3,050 m and the magnitude of its displacement is 650 m north.
Explanation:
Distance refers to the length between any two points in space, while displacement refers to the distance from a start position to an end position regardless of the path.
In other words, distance refers to how much space an object travels during its movement; is the quantity moved. It is also said to be the sum of the distances traveled. The distance traveled by a mobile is the length of its trajectory and it is a scalar quantity. In this case, the distance is calculated as:
1850 m + 1200 m= 3,050 m
Displacement refers to the distance and direction of the final position from the initial position of an object. The displacement effected is a vector quantity. The vector representing the displacement has its origin in the initial position, its end in the final position, and its module is the distance in a straight line between the initial and final positions. That is, when expressing the displacement it is done in terms of the magnitude with its respective unit of measurement and the direction because the displacement is a vector type quantity. Mathematically, the displacement (Δd) is calculated as:
Δd= df - di
where df is the final position and di is the initial position of the object.
In this case, the displacement is calculated as:
1850 m - 1200 m= 650 m
Since the distance to the north is greater, the direction of travel will be to the north.
The distance it has traveled is 3,050 m and the magnitude of its displacement is 650 m north.
Electrical energy is widely used among the various sources of energy...Justify
Answer:
Electricity is both a basic part of nature and one of the most widely used forms of energy. The electricity that we use is a secondary energy source because it is produced by converting primary sources of energy such as coal, natural gas, nuclear energy, solar energy, and wind energy, into electrical power.
please help me I need to get this right
20 points please helppp me I’m begging u this is due soon please come on ????? Anyone
Answer:
Gases are element .We can change the state of matter by the process of melting,evaporation,sublimation,freezing,condensation.
A body initially moving with a speed of 20m/s covers a distance of 150m after 5 sec .What is the acceleration of the body?
Answer:
a=4m/s2
Explanation:
Vi= 20m/s
S=150 m
t= 5 sec
a=?
using 2nd equation of motion;
S= Vit+0.5at^{2}
putting values
150= (20)(5)+0.5(a)([tex]5^{2}[/tex])
150-100= 12.5a
50/12.5 =a
4m/s2=a
How are points made in soccer ?
a- by kicking the ball into the goal net
b - by carrying the ball into end zone
c - by shooting the ball into the hoop
Answer:
a- By kicking the ball into the goal net
Explanation:
You cant pick the ball up so b is not the answer and there is no hoop so c is also not the answer. The answer is A
8.
What quantities are needed to describe the position of a water fountain relative to where you are standing?
Answer:
D. the distance and direction to the water fountain
Explanation:
To describe the position of a water fountain relative to where one is standing, the distance and direction to the water fountain must be known.
This quantity is known as the displacement.
Displacement is a vector quantity with both magnitude and direction. To specify the magnitude of a displacement, we use the length of path and in this case the height or sometimes the distance. The direction attribute distinguishes distance from displacement The perfect quantity to solve this problem is the displacement and it specifies the distance of the path and the direction traveled.how can we take advantage of waste materials
Answer:
we can incinerate waste materials and use the product as fuel rather than dumping them. It may produce carbon dioxide but we can create a machine that can convert carbon into energy.
why do compass needles around a current carrying wire point in different directions
Answer: because of the magnetic
Explanation: If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.
What does the atomic number of an atom tell us?
How much the atom weighs
The number of protons in the atom
Which column the element is in on the periodic table
The number of electrons it is likely to lose
Answer:
the number of protons in the atom.
Explanation:
Answer:
the number of protons in the atom
Explanation:
Circle the correct word(s) in brackets to complete each sentence.
i) Hooke's Law works for ( springs only / all materials / some materials ).
ii) Hooke's Law only applies ( up to / over ) a certain force.
iii) The force at which Hooke's Law stops working for springs is
( higher / lower ) than
for most other materials?
Answer:
i) Hooke's Law works for some materials
ii) Hooke's Law only applies up to a certain force
iii) The force at which Hooke's Law stops working for springs is lower than for most materials
Explanation:
Hooke's Law of elasticity states that the deformation of an elastic material is proportional to the applied for small deformations
The law is applicable to elastic materials whose values of deformation or extension as well as the applied load or stress are expressible by a single real number
Hooke's Law is applicable when the force and the extension of the elastic material are proportional, at larger force, the elastic material is observed to expand more than as expected based on Hooke's Law
The nature of springs is such that its elastic limit is reached by a much lower force than for most materials. Therefore, Hooke's law stops working for springs at a lower force than for most materials.
In a nuclear station if the temperature of the superheated water starts to decrease what should the engineer in charge of the reactor do?
Answer:
They sh0uld g0 t0 the reactor and then, see what the issue is...
Explanation:
then, see if they can fix the problem, im sorry if its wr0ng.
Help plz i’ll mark branliest
Answer:
please give me BRAINLIEST Answer
Explanation:
10.0 210.0 ms2
5.0 25.0 ms2
15.0 215.0 ms2
ten point on important of sports and games in human life