A ball is thrown horizontally at a speed of 24 meters per second from the top of a cliff. if the ball hits the ground 4.0 seconds later, approximately how high is the cliff?
Answer:
78.4 m
Explanation:
To obtain the height of the cliff;
We can use the Relation to obtain the final velocity, v
v = u + at
a = acceleration due to gravity = 9.8m/s²
v = 0 + (9.8*4)
v = 0 + 39.2
v = 39.2 m/s
To obtain the Height, S
v² = u² + 2aS
39.2^2 = 0 + 2(9.8)S
39.2^2 = 0 + 19.6S
1536.64 = 19.6S
S = 1536.64 / 19.6
S = 78.4 m
A bicyclist is traveling at +25 m/s when he begins to decelerate at -4 m/s2. How fast is he traveling after 5 seconds?
Answer:
The bicyclist goes at 5 m/s
Explanation:
Motion With Constant Acceleration
It's a type of motion in which the velocity of an object changes uniformly in time.
The equation that rules the change of velocities is:
[tex]v_f=v_o+at[/tex]
Where:
a = acceleration
vo = initial speed
vf = final speed
t = time
It's given a bicyclist is traveling at v0=+25 m/s and decelerates at [tex]a=-4\ m/s^2[/tex]. We are required to calculate the speed after t=5 seconds.
Applying the formula:
[tex]v_f=25+(-4)*5[/tex]
[tex]v_f=25-20=5[/tex]
[tex]v_f=5\ m/s[/tex]
The bicyclist goes at 5 m/s
What do these two changes have in common? making paper from wood
photosynthesis
Select all that apply.
Both are chemical changes.
Both are changes of state.
Both conserve mass.
Both are caused by heating.
Answer:
Both are chemical change as the new product is formed with new characteristics and can't be brought back to previous form.
A fat person weighing 80 Kg falls on a concrete floor from 2m. If whole of the mechanical energy is converted into heat energy, then heat produced in SI units will be nearly
Answer:
The heat produced is 1568 J
Explanation:
The given parameters are;
The mass of the person, m = 80 kg
The height from which the person falls, h = 2 m
Mechanical Energy, ME = Potential Energy, PE + Kinetic Energy, KE
At the height, from where the person falls, the initial velocity of the person = 0 m/s
Therefore;
The initial kinetic energy, K.E. = 1/2·m·v² = 1/2 × 80 kg × (0 m/s)² = 0 J
From which we have;
The Mechanical Energy, M.E. = The initial Potential Energy, P.E. + 0 J
∴ The Mechanical Energy, M.E. = The initial Potential Energy, P.E.
The initial Potential Energy, P.E. = m·g·h
Where;
m = The mass of the person
g = The acceleration due to gravity ≈ 9.8 m/s²
∴ The initial Potential Energy, P.E. = 80 kg × 9.8 m/s² × 2 m = 1568 J
The Mechanical Energy, M.E. = The initial Potential Energy, P.E. = 1568 J
The whole mechanical energy is converted into heat energy, therefore, we have;
The Mechanical Energy, M.E. = The heat energy = 1568 J
The heat produced = The heat energy = 1568 J.
What stresses can you experience in nursing
Answer:
Yes, Nurses are experience a stress in a higher rate at workplace.
Explanation:
We know that,
Stress in nursing :
According to association of american holistic nurses,
Nurses are experience a stress in a higher rate at workplace.
These stress are,
Physical demand
Management problems
lack of staff
Increment of number of patients
Face with death,
Fighting to infection as highly stressful factors in the workplace
Hence, Yes, Nurses are experience a stress in a higher rate at workplace.
A flexible container holds 1.5 L of gas at a pressure of 3 atm. The volume is adjusted and the new pressure is measured at 2 atm. What is the new volume of the container?
Answer:
The final volume of the gas is 2.25 L.
Explanation:
Given;
initial volume of the gas, V₁ = 1.5 L
initial pressure of the gas, P₁ = 3 atm
final pressure of the gas, P₂ = 2 atm
final volume of the gas, V₂ = ?
Apply Boyle's law to determine the final volume of the gas;
P₁V₁ = P₂V₂
V₂ = (P₁V₁) / P₂
V₂ = (3 x 1.5) / (2)
V₂ = 2.25 L
Therefore, the final volume of the gas is 2.25 L.
Help please this is worth 30% of my grade in total
Answer:
D. Both are held together by gravitational forces
Explanation:
The common features in galaxies are;
Gravity holds the stars togetherThe dense region in a galaxy is the centerThey all have a faint outer region and mysterious dark matter haloThey all have stars, planets, asteroids, galactic cloudWhat is the netforce of the dog thanks!
Answer:
5 Newtons Up and 5 Newtons Right
Explanation:
Treat each force vector as a value and choose the upward and rightward directions to be positive. Downward and Leftward forces will be considered "negative". For the vertical net force we have a positive 10 N upwards and a negative 5 N downwards. The net force in the vertical will be 5 N upwards. In the horizontal we have 10 N to the right and 5 N to the left. The net force in the horizontal will be 5 N to the Right.
It is easier if you split the motion into horizontal and vertical components.
Describe the conceptual relationship between energy and force.
Answer:
When two objects interact, each one exerts a force on the other that can cause energy to be transferred to or from the object. For example, when energy is transferred to an Earth-object system as an object is raised, the gravitational field energy of the system increases.
Explanation:
Force and work are directly proportional to each other, while force and displacement are indirectly propotional. The equation showing the relationship is W= Fd. W represents work measured in joules; F represents force in newtons; and d represents distance in meters.
What is a transferable skill?
ОА.
a summary of experiences
OB.
the ability to do something
C.
the movement of skills from one experience to another
OD
a skill you learn from another person
Answer:
I think D is correct option
How does surface area affect the amount of air resistance an object experiences?
The laws of reflection holds for__
a) plane mirrors. b) spherical mirrors.
c)both. d) None of them.
Answer:
c)both
Explanation:
The laws of reflection hold true for all the reflecting surfaces either spherical or plane. Therefore, the plane mirror, concave mirror and the convex mirror all will follow the laws of reflection.
Answer:
It holds for only plane mirrors
It states that the angle of incidence is equal to the angle of reflection.
This is only possible in plane mirrors only
Difference between Pascal’s law and law of flotation
Objects tend to continue in their current state, if it is rest or uniform motion. What is the term for this tendency
Answer:
Inertia
Explanation:
The term for the tendency is inertia.
The inertia of a body is the tendency of the body to remain unmoved when at rest and the tendency to keep moving when in motion. In other words, it is the tendency of a body to remain in a state of rest or motion.
A static body will remain in a state of perpetual rest if no force acts on it and a moving body will keep moving in the same direction if no force acts on it. The force that needs to be overcome in order to change the state of the object is otherwise known as inertia force.
pleease answer this right ill give you 50 points
Answer:c a b I think I might be wrong but I’m pretty sure that’s it
Explanation:
What are not examples of velocity
Answer:
Explanation:
Acceleration roughly means “change in velocity.” If this change in velocity is consistently in one direction, the body will reach a point at which its velocity is zero.
Another consideration is when you drop a basketball onto the pavement. The ball falls, hits the ground, and comes back up. Because its direction of motion changed, you know that its velocity MUST have been 0 m/s at some point during the bounce.
This doesn't mean there was no acceleration at this point.
Johanna is studying what happens to the energy as a ball rolls down a ramp. What is one form of energy that she is studying? gravitational potential energy electrical energy chemical energy elastic potential energy
Answer: gravitational potential energy
Explanation:
Gravitational potential energy is refered to as the potential energy that an object has due to its gravitational field, which in turn is being turned into a kinetic energy when there is a fall of such objects.
Since Johanna is studying what happens to the energy as a ball rolls down a ramp, the form of energy here is the gravitational potential energy.
Answer:
the answer is A
Explanation:
gravitational potential energy
A student is standing in an elevator that travels from the first floor to the thenth floor of a building.The student exerts the greatest force on the floor of the elevator when the elevator is
Answer:
accelerating upward as it leaves the first floor.
Explanation:
When a person moves up in the elevator, the person's apparent weight is less then the actual weight. The person feels less weight than his or her actual weight. But just before the elevator starts moving the apparent weight of the person is equal to the normal or actual weight of the person before the movement. And after moving up in the elevator, the apparent weight is less than the actual weight, as one is moving against the force of gravity.
So in the context, the student exerts greatest force on the 1st floor as the elevator is accelerating upward when it leaves the first floor.
A dilute solution has of solute in the solvent
Explanation:
"The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution. A concentrated solution is one that has a relatively large amount of dissolved solute. A dilute solution is one that has a relatively small amount of dissolved solute."
Kepler’s third law of planetary motion states that the square of a planet's orbital period is proportional to the cube of the average distance between the planet and the sun.
Please select the best answer from the choices provided
T
F
Answer:
Based on the options given, the most likely answer to this query is The square of the orbital periods of the planets are directly proportional to the cubes of their average distances from the Sun.
Explanation:
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pleas help me phyic science
Answer:
D
Explanation:
The amount of energy present in the matter
Which samples will heat up faster? circle one 100 g (least massive) 200 g (most massive) No Difference Explain your reasoning:
if Circle one 100 g (least massive) and 200 g (most massive) have the same material then the least massive i.e 100g heat faster.
what is specific heat?The amount of heat required to raise the temperature of an object is proportional to its mass. Specifically, the heat required is given by,
the formula
Q = m × c × ΔT
Where Q= is the amount of heat required
m= is the mass of the object
c= is the specific heat capacity of the material, and ΔT is the change in temperature.
If the two samples are made of the same material and have the same initial temperature, their specific heat capacities and the change in temperature will be the same.
Then, the amount of heat required to raise the temperature of the 100 g sample will be half that of the 200 g sample. This means that the 100 g sample will heat up more than the 200 g sample, as it requires less heat to raise its temperature.
Therefore, The sample with 100 g (least massive) will heat up faster than the sample with 200 g (most massive) if both samples are made of the same material and have the same initial temperature.
To learn more about specific heat click:
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HELP PLEASE WILL GIVE BRAINLIEST!
Find the mass of an object that has a density of 1.5 g/cm^3 and has a volume of 8 cm^3
Answer:
12 grams
Explanation:
To calculate mass, we can use the following formula:
Mass = density × volume
Plug in the values
Mass = 1.5 × 8
Mass = 12
Therefore, the mass of the object is 12 grams.
I hope this helps!
In every population there is variation. It is important that this variation.
Answer:
Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population.
rate the ans plz.
The velocity of a vehicle is typically expressed relative to which of the following?
The question is incomplete, however, The velocity of a vehicle is typically expressed relative to ground.
velocity is the measurement of a body's "pace of change of displacement in relation to time" when the body is traveling along a straight route.It is common knowledge that the word "linear" refers to something that is straight; therefore, when the body moves in a straight path, it is said to be linear velocity .Alternatively, velocity is the distance traveled by a body traveling in a specified direction during a predetermined period of time. Thus, the fundamental idea of linear velocity is provided by the union of these two quantities.Because it always has a direction velocity is a vector.To know more about velocity visit : https://brainly.com/question/19979064
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When does a car show positive acceleration?
Answer:
When it is accelerating or gaining velocity.
Explanation:
A car show positive acceleration when it is accelerating or gaining velocity. It would show negative acceleration if it was de-accelerating, slowing down or coming to a stop.
Answer:
When the velocity is increasing in the positive direction
Explanation:
А
ray of light is incident on the surface of water at 45, and it gets refracted
inside water at an angle of 32. The absolute refractive index of water is
Explanation:
Using Snell's Law, we have 1sin45° = nsin32°.
=> n = sin45° / sin32° = 1.33.
The refractive index of water is 1.33.
Two boys, shrijan having weight 600N and shrijesh having weight 300N are playing see-saw. If shrijan is sitting at 2m from fulcrum, where should shrijesh sit from fulcrum to balance shrijan?
plzzzzzz help me
Answer:
Shrijesh should be located at 4[m] from the fulcrum point.
Explanation:
We must keep in mind that the moment around the point of rotation (fulcrum) must be equal, so that the bar remains in balance.
The moment for shrijan is:
[tex]M=F*d\\M=600*2\\M_{shrijan}=1200[N*m][/tex]
So if the moment should be equal, the distance can be obtain from the same equation using the shrijesh's force or weight.
[tex]M_{shrijesh}=F*d_{2}\\1200=300*d_{2}\\d_{2}=4[m][/tex]
It will be easier to lift a load in wheel Barrow if the load is moved towards the wheel. Give reason
Answer:
yes, majority of the weight will be supported by the front wheel and not by you.
Explanation:
A negative charge of -2.0 C and a positive charge of 3.0 C are separated by 80 m. What is the electrostatic force between the two charges? Is the force attractive or repulsive? How do you know?
Answer:
1. 8437500 N
2. The force between the two charges is attractive.
Explanation:
1. Determination of the force between the two charges.
Charge 1 (q₁) = –2.0 C
Charge 2 (q₂) = 3.0 C
Distance apart (r) = 80 m
Electrical constant (K) = 9×10⁹ Nm²/C²
Force (F) =?
F = Kq₁q₂ / r²
F = 9×10⁹ × 2 × 3 / 80²
F = 5.4×10¹⁰ / 6400
F = 8437500 N
Thus, the force of attraction between the two charges is 8437500 N
2. From the question given, the charges are:
Charge 1 (q₁) = –2.0 C
Charge 2 (q₂) = 3.0 C
We understood that like charges repels while unlike charges attract. Since the two charges (i.e –2 C and 3 C) has opposite signs, it means they will attract each other.
Thus the force between them is attractive.