Answer:
Originally Answered: What is the unit of measurement of pressure in the atmosphere? The SI derived unit of pressure is the pascal , abbreviated Pa. This is a pressure exerted by a force of 1 newton acting over an area of 1m².
Explanation:
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1. According to the text, what are plastics made of?
A. specially treated silicon
B. negatively charged particles
C. long chains of carbon molecules
D. a standard photovoltaic cell
Answer:
c. long chains of carbon molecules
A physics student throws a ball thrown horizontally from the top of a building with a speed of 8 m/s. The student measures the height of the building to be 15m.
Answer:
Following are the solution to the given question:
Explanation:
Please find the complete question in the attached file.
[tex]a_x = 0\\\\a_y = -g = -9.81\ \ \frac{m}{s^2} \\\\v_{iy} = 0 \\\\y = v_{iy} \times t+ \frac{1}{2ay} \times t^2 \\\\ 15 = \frac{1}{2} \times 9.8 \times t^2 \\\\t = \sqrt{(2 \times \frac{15}{9.8})} \\\\[/tex]
[tex]= 1.75 \ sec \\\\[/tex]
Distance:
[tex]x = v_{ix} \times t \\\\[/tex]
[tex]= 8 \times 1.75\\\\= 14 m[/tex]
Using the concept of motion, the answers to the question posed on the motion of a dropped ball are :
Vertical component of acceleration = - 9.8 m/s²Horizontal component of acceleration = 0Initial vertical Velocity = 0Time taken = 1.75 seconds Landing distance from building = 14 metersThe vertical component of acceleration is denoted as [tex]a_{y} [/tex] :
The gravitational force acting on the ball in the downward direction has an acceleration of - 9.8 m/s². Hence,
[tex]V_{y} = 9.8 m/s^{2} [/tex]Gravitational force only acts downwards along the vertical, hence, horizontal component of acceleration will be Zero.
[tex]V_{y} = 0 [/tex]then the vertical component of x, will be 0
[tex]V_{x} [/tex] = 0The initial vertical velocity ; [tex]V_{iy} is Zero [/tex] :
[tex]V_{iy} = 0 [/tex] :The time taken :
S = 0.5gt² ; S = distance = 15 meters ; g = - 9.81
15 = 0.5(9.8)t²
15 = 4.9t²
t² = (15 ÷ 4.9)
t² = 3.061
t = √3.061
t = 1.75 seconds
Landing Distance from building :
Horizontal speed × time taken
[tex]V_{ix} \times 1.75 [/tex]
[tex]8 \times 1.75 = 14 meters [/tex]
Therefore, the ball landed 14 meters away from the building.
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Question 24 (1 point)
A 85 kg boy is riding his bicycle in circles with a radius of 7.2 meters. It takes him 6
seconds to make ones revolution. What is his velocity?
730 m/s
0.53 m/s
1.25 m/s
4:
7.54 m/s
A boy of mass 85 kg is riding a bicycle in a circle with a radius of 7.2 meters, and it takes 6 seconds to make one revolution, then his velocity will be equal to 7.54 m/s.
What is tangential velocity?The movement of an object along the circle's edge which path is always at the tangent to any specific point on the circle is described by tangential velocity.
As a result, tangential velocity is the amount of motion along a circle's edge that may be measured at any given time.
The speed at any location that really is tangent to the rotating wheel is quantified as the tangential velocity in a circular motion. The connection between rotational acceleration and tangential velocity is expressed by the formula. The part of movement along the circle's edge that can be detected at any time is called tangential velocity.
The given data in the question,
Radius, r = 7.2 meters.
Time, t = 6 seconds.
v = 2πr / t
v = 2π(7.2)/6
v = 7.54 m/s.
Therefore, the velocity of the boy is 7.54 m/s.
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A weather balloon is inflated with 0.80 m3 of helium (He) at ground level (pressure is 1.0 atm). The balloon is released and rises into the air. What is the atmospheric pressure when the gas in the balloon expands to a volume of 3.32 m3?
Answer: 0.24 atm
Explanation:
To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is directly proportional to the volume of the gas at constant temperature.
The equation given by this law is:
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 1.0 atm
[tex]V_1[/tex] = initial volume of gas = [tex]0.80 m^3[/tex]
[tex]P_2[/tex] = final pressure of gas= ?
[tex]V_2[/tex] = final volume of gas = [tex]3.32m^3[/tex]
Putting values in above equation, we get:
[tex]1.0\times 0.80m^3=P_2\times 3.32m^3[/tex]
[tex]P_2=0.24atm[/tex]
Thus the atmospheric pressure of the gas is 0.24 atm
A plant is said to be an exact copy of the parent plant when it has ALL the same characteristics that the parent plant has. Do you agree with this statement? Justify.
Explanation:
In Asexual reproduction , part of parent plant is detached and grows to become a complete plant. In this process plant produced is generally identical to the its parent plant. It has ALL the same characteristics that the parent plant has. However, this is not true in case of sexual reproduction of plants.
There are some laws of physics that have to do with motion. For example Newton's first law of motion states that objects ______ or ______ will stay unless acted upon by __________.
Answer:
Newton's first law of motion states that objects state of rest or uniform motion will stay unless acted upon by an external force
Explanation:
Newton's first law of motion is also called the Law of Inertia. Because, it describes the property of inertia of the body. Newton's First Law states that every object continues its state of rest or uniform motion, until or unless it is acted upon by an external force. It means that if an object is in state of rest, it will remain at rest until or unless an external force is not applied to it. Same goes for the state of uniform motion. Hence, the answer will be:
Newton's first law of motion states that objects state of rest or uniform motion will stay unless acted upon by an external force
Answer: Newton's first law of motion states that objects at rest or in motion will stay unless acted upon by a net external force.
Explanation:
Motion is typically described in terms of velocity, acceleration, displacement and time. An object's velocity cannot change unless it is acted upon by a force, as described by Newton's first law also known as inertia. More generally, the term motion signifies any spatial and or temporal change in a physical system.
Many scientists have studied motion and it's properties because of its importance to life. The Italian, Galileo Galile, who lived from 1564 to 1642, did the first systematic study of motion. Also Sir Issac Newton did more detailed work on the study of motion. In his works in motion he came about three different laws.
- Newton's first law: This states that objects at rest or in motion will stay unless acted upon by a net external force.
-- Newton's second law: This states that the force on an object is equal to its mass times its acceleration.
- Newton's third law: This states that for every action there is an equal and opposite reaction.
A basketball player jumps straight up with a speed of 14 m/s. How high did the player jump?
Answer:
ttrftyrdy
Explanation:
tytrterte
The ratio between the velocity of microwaves to the velocity of gamma ray in air is_____ .
less than 1
greater than 1
equal to 1
no correct answer
Answer:
velocity of all electromagnetic waves are
[tex] \huge3 \times {10}^{8} m {s}^{ - 1} [/tex]
So, the ratio is equal to 1.
1. how much time will it take for a bug to travel 5.0 meters
If it travels it a velocity of 1.4 m/s South?
this will have to do with that which statement describes seismic waves?
Answer:
an elastic wave in the earth produced by an earthquake or other means
Explanation:
Answer:
They carry energy
Explanation:
Describe two adaptations and explain how they help you survive.
Answer:
My feet and my fists
Explanation:
My feet help me walk
and my fists help me one punch people
A basketball player jumps straight up with a speed of 14 m/s. How high did the player jump?
Answer:
The basketball player jumped 10 m high.
Explanation:
Vertical Launch Upwards
In a vertical launch upwards, an object is launched vertically up without taking into consideration any kind of friction with the air.
If vo is the initial speed and g is the acceleration of gravity, the maximum height reached by the object is given by:
[tex]\displaystyle h_m=\frac{v_o^2}{2g}[/tex]
The basketball player jumps up with a speed of vo=14 m/s. The maximum height is:
[tex]\displaystyle h_m=\frac{14^2}{2*9.8}[/tex]
[tex]\displaystyle h_m=\frac{196}{19.6}=10[/tex]
The basketball player jumped 10 m high.
One model of tennis ball launcher has advertised that it is capable of
imparting 15,000 J of kinetic energy to a 0.5 kg ball initially at rest. A
student carefully measures the compression of the spring to be 0.10 m-
What is the value of the spring constant for the tennis ball launcher
according to the data provided?
Answer:
The answer for the first question is: 3,000,000 N/m
The answer for the second question is: If the question was, "Which of the following is the best example of kinetic energy being transformed into potential energy?" then the answer is winding the spring on a toy car
Explanation:
For the first question: I have no explanation, I just got it right on my test so I thought i'd help you out.
For the second question: (i'll try to explain the best I can).
Kinetic energy = energy in motion
Potential energy = stored energy
so when winding the spring of a car you are using energy in motion (kinetic energy) to create stored energy (potential energy) that will be used to move the car. So it goes something like:
kinetic energy > potential energy > kinetic energy
two sources of error and precaution in the centre of gravity experiment
Answer:
The answer to this question is given below in this explanation sections.
Explanation:
The weight of an object is concentrated at the center of gravity.The term center of gravity is used interchangeably with center of mass.For a symmetrical object the center of mass is located at the geometric center of the object.If the object is not symmetric we can determined the center of mass using the mentioned below.
Materials:
cardboardweight(washer,bolt,or fishing weight)hole punchpencilProcedure:
Cut the cardboard into a strange shape.Do not use a circle,square,rectangle,or any other common geometric shape.Punch a hole near the edge of the cut-out cardboard piece and hang it from a nail.Place the weight, a washer or bolt, on a thread and tie it off.Hang the thread and weight from the nail in front of the cardboard.use a pencil to draw a plumb line down the cardboard where the thread touches.This mark your center line from that hanging point.conclusion:
What would happen to the center of gravity of the shape if you were to spin it freely?
center of gravity experiment:
Balance a ruler with a hammer.Take a rubber band or string and make a loose loop around the hammer and ruler. Make sure the end of the hammer is touching the ruler,and then positions the ruler at the edge of the table.Balance two forces with a toothpick.A common magic trick using the properties of center of gravity.The two forks are balanced on the edge of the glass by a toothpick. Stand with your back and feet against a wall.Have someone place quarter on the floor at your feet.Try to pick it cup.Most people cant make these adjustments.Stand against a wall sideways with your arm and leg touching the wall,with nothing to from the out away hold onto.Try to lift your other leg straight out away from the wall.you wont be able to do it.The girls away win chairs lifting challanges place dining chairs against a wall.Bend over the chair so that your head touches the wall and you upper body is parallel to the floor.lift the chair to your chest to your chest and then try to stand up.If there is an unbalanced force acting on an object, the object will?
(A)Accelerate
(B)Move at a constant velocity
(C)Remain at rest
(D)Change direction
Answer:
A
Explanation:
because newton's second law states that if a resultant force acts on an object then, it will accelerate in the direction of the resultant force
The vehicles are fitted with shockers why
Shockers acts as a shock absorber in the vehicle making the ride comfortable. When vehicle goes on rough road then it gets shocks from the road deformities the springs present in the shockers provide counter force and thus making the vehicle stable ride without shock.
[I copied this from the internet, but hope it helps!]
please help me out ! I will be marking brainliest! thanks! <3
Answer:
#1. decrease
#2. increases
#3. increases
#4.increases
Explanation:
The sum of all forces acting on an object is what is referred to as _________
Group of answer choices
Mass
Net Force
weight
Normal force
The radius of a Bromine (Br) atom is 100 pm. What is its' Circumference?
Answer:
The circumference of the bromine atom is 628 pm
Explanation:
The formula for the circumference of a circle is 2πr.
Where π is 3.14 and r is the radius of the circle.
Since atoms have a circular shape. The formula above can be used to determine the circumference of an atom (bromine atom in particular).
circumference of the bromine atom is 2πr (where r is 100 pm)
2 × 3.14 × 100 = 628 pm.
The circumference of the bromine atom is 628 pm
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Energy stored in the bonds between atoms is called
A.kinetic energy.
B.mechanical energy.
C.chemical energy.
D.thermal energy.
Answer:
it's answer is Compound chemical energy
hope it helps you
I need help with questions #2 and #3
Answer:
Im sorry i can't read it is to small
Lavon is going to the beach on a hot summer day. He wants to take a bottle of cold water
What material would be best to wrap the bottle to keep the water cool?
Answer:
aluminum foil and cotton
Explanation:
It was found that the aluminum foil and cotton were the best insulators for keeping the water cold while the Styrofoam sheets and the bubble wrap were the worst two insulators for keeping the water cold.
A student is playing with a pendulum. He gives the ball a push and watches the ball as it swings. After a while, the ball stops swinging.Why does the ball stop swinging?
Why does a third class lever cannot magnify force?
Explanation:
The third class lever cannot magnify our force because in third class lever the effort it between the load and the fulcrum. Also, in this type of lever no matter where the force is applied, it is always greater than the force of load. Hence, That type of lever cannot magnify our force.
What is Physics? How is Physics used in your everyday life? Give at least two examples and explain your answer. You need at least 3
Answers:
The transportation industry is no stranger to the manipulation of everyday physics. Cars and trains utilize the wheel, which provides a smooth, steady motion.
The ears hear sounds which occur through the movement of air molecules, and the chemistry that drives all of biology depends on the physics of energy and molecules. Every day, for example, plants absorb sunlight, water, and carbon dioxide, creating glucose and releasing oxygen as a byproduct.
Brainlist pls!
A pizza delivery car, parked 200 m East of a restaurant, moves to a position 600 m West of the same restaurant in 18 s. Calculate the average velocity of the delivery car in moving to its new position
Answer:
22.2m/sExplanation:
Average velocity is expressed as;
Average velocity = Displacement/Time
Get the displacement
If a pizza delivery car, parked 200 m East of a restaurant and moves to a position 600 m West
The displacement = 600 -200
Displacement = 400m
Time = 18s
Substitute and get the velocity;
Average velocity = 400/18
Average velocity = 22.2m/s
Hence the average velocity of the delivery car in moving to its new position is 22.2m/s
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A tennis ball is hit with a speed of 30 m/s at an angle of 40 degrees above the horizontal. What is the range of the ball?
Answer:
90.44 m
Explanation:
From the question given above, the following data were obtained:
Initial velocity (u) = 30 m/s
Angle of projection (θ) = 40°
Acceleration due to gravity (g) = 9.8 m/s²
Range (R) =?
The range of the ball can be obtained as follow:
R = u² Sine 2θ / g
R = 30² Sine (2×40) / 9.8
R = 900 Sine 80 / 9.8
R = 900 × 0.9848 / 9.8
R = 886.32 / 9.8
R = 90.44 m
Therefore, the range of the tennis ball is 90.44 m
What are clouds called that generate rain?
A) cirrus clouds
B) nimbus clouds
C) stratus clouds
D) cumulus clouds
Answer:
B= nimbus clouds
Answer:
B= nimbus clouds
An object is traveling at a constant velocity of 10 m/s when it experiences a constant acceleration of 3.5 m/s2 for a time of 10 s. What will its velocity be after that acceleration?
Answer:
The final velocity of the object is 45 m/s.
Explanation:
Given;
initial velocity of the object, u = 10 m/s
acceleration of the object, a = 3.5 m/s²
time of motion, t = 10 s
The final velocity of the object is given as;
v = u + at
where;
v is the final velocity of the object
v = 10 + (3.5 x 10)
v = 45 m/s
Therefore, the final velocity of the object is 45 m/s.