Answer:
Force = Mass × Acceleration
F = MA
F = 30kg × 3ms^-2
F = 90 N
Describe how you can tell if an object is accelerating by observing its motion. Be sure to cover all cases.
If object is changing its direction or speed of the object is changing then the object is said to be accelerating
Acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down. Motion on a circle is accelerated even if the speed is constant, because the direction is continually changing.
If an object is changing its velocity -whether the velocity is changing by a constant amount or by a varying amount a constant amount - then it is an accelerating object.
Since, acceleration is a vector quantity and vector quantity have both magnitude and direction , this implies that if the body is changing its direction then also the object is said to be accelerating.
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What is the depth of water in a tank with 300,000 gallons of water at 70F when the pressure gauge at the bottom of the tank reads 23 psig?
The depth of water in the tank is determined as 16.2 m.
What is hydrostatic pressure?Hydrostatic pressure is the pressure exerted by a fluid at equilibrium at any point of time due to the force of gravity.
The hydrostatic pressure of the water column is calculated as follows;
P = ρgh
where;
ρ is density of the waterg is acceleration due to gravityh is vertical height or depth of the waterh = P/ρg
The given parameters;
Pressure of the water, P = 23 psig = 158579 N/m²g is acceleration due to gravity = 9.8 m/s²ρ is density of water = 1000 kg/m³h = (158579) / (1000 x 9.8)
h = 16.2 m
Thus, the depth of water in the tank is determined as 16.2 m.
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Newton’s universal law of gravity tells us that F = G(m1m2/d2). Newton’s second law tells us that a = Fnet/m.
(a) With a bit of algebraic reasoning show that your gravitational acceleration toward any planet of mass M a distance d from its center is a = GM/d2.
(b) How does this equation tell you whether or not your gravitational acceleration depends on your mass?
At a certain temperature, a rod is hung from an aluminium frame. A small gap exists between the rod and the floor. The frame and rod are heated uniformly. Explain whether the rod will ever touch the floor, assuming that the rod is made from (a) aluminium and (b) lead.
Answer:
The aluminum rod will never touch the floor since both the frame and the rod expand at the same rateThe lead rod will touch the floor if both frame and rod are heated long enough since the coefficient of linear expansion of lead is greater than the coefficient of linear expansion of aluminumExplanation:
At the beginning of the 100 meter dash, a runner accelerates at a rate of 5 m/s 2 until he reaches his maximum speed of 10 m/s . How long does it take him to reach his maximum speed?
Answer:
V = a * t for uniform values
t = V / a = 10 m/s / (5 m/s^2) = 2 sec
An elevator moves upward while increasing speed. Which of the following statements comparing the force of the cable on the elevator T and the weight of the elevator W is correct?
Answer:
See below
Explanation:
Downward force = weight = mg where g = accel of gravity 9.81 m/s ^2
the tension force acting UPWARD to cause the elevator to accelerate upward is F = T=m(a+g) where ' a ' is the UPWARD acceleration ...the tension must be equal to
the weight of the object + mass of object* acceleration
Complete the Aristotle quote:
"States of character arise from ______________."
A state of character arises from the repetition of similar activities
Aristotle was a renowned scientist and philosopher. He has made significant contributions to society. He is renowned for his quotable sayings as well. Because of the correlation between the states of character and the distinctions between them, the behaviors we display must be of a specific type. States of character: The traits that "allow us to stand well or poorly in relation to the passions." Because: We are not commended and criticized only for having the ability to feel pleasure, grief, etc., virtues are not capacities.
Here in this quote, similar behaviors give birth to similar states of character
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The position of a squirrel running in a park is given by r⃗ =[(0.280m/s)t+(0.0360m/s2)t2]i^+(0.0190m/s3)t3j^. At t = 4.00 s , how far is the squirrel from its initial position?
The position vector is obtained as r = 1.12 k + 0.58 i + 1.22 j.
What is the position?Let us consider the movement of the squirrel. We know that the position of the squirrel is defined by the equation; r⃗ =[(0.280m/s)t+(0.0360m/s2)t2]i^+(0.0190m/s3)t3j^. We can see that this equation is what defines the position of the squirrel in the three cartesian dimensions as shown in the question.
We now have the position as required at the instant where t = 4.00 s being obtained as; r⃗ =[(0.280m/s)(4)+(0.0360m/s2)(4^2) ]i+(0.0190m/s3)(4)^3j. We now finally obtain the position of the body as required as being;
r = 1.12 k + 0.58 i + 1.22 j
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An average person is 175 cm tall. How
many people could you stack one on top of
another to reach the top of the CN Tower
(553 m)?
The number of people you will stack to reach the top of the CN Tower (553 m) is 316 people
Hor to convert 175 centimeters to metersWe'll begin by converting 175 cm to m. This can be obtained as illustrated below:
100 cm = 1 m
Therefore,
175 cm = (175 cm × 1 m) / 100 cm
175 cm = 1.75 m
Thus, 175 cm is equivalent to 1.75 m
How to determine the number of people neededThe number of people needed to be stacked to get to the top of the CN tower can be o btained asfollow:
Height of tower = 553 mHeight of a person = 1.75 mNumber of people needed =?Number of people needed = Height of tower / height of a person
Number of people needed = 553 / 1.75
Number of people needed = 316 people
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What has to be done to nitrogen to make it turn into a liquid?
Answer: Hot weather concreting
Liquid nitrogen has also been used as a method for cooling concrete for over twenty years. ...
LN is produced by compressing and cooling nitrogen gas to a point below its evaporation point of about − 196 °C [− 320 °F].
Explanation:
When will you say a body is in Uniform acceleration and Non Uniform acceleration?
When body is changing its velocity at a constant rate then the body is said to be in uniform acceleration.
When a body is changing its velocity at different rates than my body is said to be moving with non uniform acceleration.
acceleration - The rate of change of velocity with respect to time.
It is a vector quantity.
a = dv / dt
SI unit is m/s²
direction of acceleration is the direction of change in velocity.
types of acceleration
uniform accelerationnon uniform accelerationinstantaneous accelerationWhen body is changing its velocity at a constant rate then the body is said to be in uniform acceleration.
When a body is changing its velocity at different rates than my body is said to be moving with non uniform acceleration.
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HELP ASAP
Referring to the map of the temperature field in the room, what was the largest variation in temperature?
1.) 2 degrees
2.) 4 degrees
3.) 1 degree.
4.) none of the above
PLEAZE HELP
round correctly
Which of the following must happen in order for atoms to bond either ionically or covalently with one another?
A The valence shells of all atoms must be filled after the bonding occurs
b The chemical properties of the atoms must be satisfied
c The ions must have different charges
d The resulting compound must follow ionic naming conventions
Which of the following must happen in order for atoms to bond either ionically or covalently with one another?
a: The valence shells of all atoms must be filled after the bonding occurs
In order for atoms to bond either ionically or covalently with one another the valence shells of all atoms must be filled after the bonding occurs.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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In science, volume may be measured in
O centimeters
O milliliters
O kilograms
O kilometers
Answer: milliliters
Explanation:
centimeters and kilometers are measurements of length/distance. Kilogram is a measurement of weight, and millimeters is a measure of how much space an object takes up.
Explain how the water cycle follows the conservation of mass. Use details to support your response.
The water cycle follows the conservation of mass because just like matter, it changes its state but not destroyed.
What is conservation of mass?Conservation of mass follows a rule which states that mass is neither created nor destroyed in chemical reactions. This simply means that for every chemical reaction, the mass of an element as a reactant will be the same at the end of the reaction.
From the given image, it can be observed that water can change its state from solid, liquid or gas in various phase transitions. These include the following:
Sublimation: Water changes from solid to gasDeposition: Water changes from gas to solid.Condensation: Here, water changes from Gas to liquid.Evaporation: Here, water changes from Liquid to gas.Melting: Here, water changes from Solid to liquid. Freezing: Here, water changes from liquid to solid.pTherefore, the water cycle follows the conservation of mass because just like matter, it changes its state but not destroyed.
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Answer:
The water cycle follows the conservation of mass because just like matter, it changes its state but not destroyed..
Explanation:
Do you think that something can freeze when it is hot? Why or why not?
Answer:
yes
Explanation:
because if you put a hot object in a cold place the energy from the hot object transfers to the cold air around it and will eventually get such a low temperature that it freezes.
Which of the following quantities are scalars?
Answer:
Explanation:
Scalars: distance and work
the value of acceleration due to gravity on mars is about 3.7m/s2. how much will an object that weights 490 on earth weigh on mars
Answer:
185 units
Explanation:
Accel of gravity on Earth is 9.1 m/s^2
so weight on Mars would be a fraction of this
3.7 / 9.81 x 490 = 185 units
A book had 250 J of potential energy when it is on a shelf that is 4.2 m high. What is the mass of the book?
A person pushes on a stationary 125 N box with a force of 78 N at 30∘ below the horizontal, as shown in the figure. (Figure 1) The coefficient of static friction between the box and the horizontal floor is 0.72. What is the normal force on the box?
The normal force on the stationary box pushed by the person is determined as 108.25 N.
What is normal force?Normal force is defined as the force that any surface exerts on any other object.
Normal force acts in opposite direction to the weight of an object.
The normal force on the box is calculated as follows;
Fn = mg cosθ
Fn = W cosθ
where;
W is the weight of the objectm is the mass of the objectg is acceleration due to gravityθ is the angle of inclination of the planeSubstitute the given parameters and solve for the normal force on the box,
Fn = 125 x cos30
Fn = 108.25 N
Thus, the normal force on the stationary box pushed by the person is determined as 108.25 N.
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Rannie travelled by train from New York to New Jersey She travels 350 kilometers to the north. But, then the track turns back to south 125 kilometers. Calculate Radha's total displacement using displacement formula?
Answer:
225 km north
Explanation:
Displacement = 350 km north + 125 km south
= 350 km north - 125 km north
= 225 km north
the use of solar energy should be increase in the context of Nepal.justify the statement
Answer:
The solar potential in Nepal is 50,000 terawatt-hours per year, which is 100 times larger than Nepal's hydro resource and 7,000 times larger than Nepal's current electricity consumption. Solar can easily meet all future energy needs in Nepal. Solar energy is cheaper than fossil fuels, nuclear and hydro.
In a classroom you were locked up with your classmates and the oxygen is running out of what would you do on that occasion?
Oxygen deficiency in closed spaces may not be noticeable, but this does not mean that it is not dangerous.
If we are locked up in a classroom with our classmates, then the reduction in oxygen levels in the classroom could be due to the continues respiration process being performed by all the living beings present in the classroom.
The very first thing we will do is to knock on the door—and knock hard—and will ask, “Is anyone there?" until we get a response from outside.
Also we can check for the window in the room, if it exists, then by breaking it from inside we can brake out of the room.
Also it is very important to stay calm and avoid freaking out on that occasion.
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under what conditions do plasma exist .?
The plasma exists in the condition of the excited state of matter.
The atmosphere stops being made of gas at a height of about 80 kilometers above the surface of the Earth. Instead, it is composed of ionized gas, which has a balanced ratio of neutral particles, positive ions, and electrons. The name of this state is plasma.
Despite being referred to as the "fourth state of matter," many astrophysicists believe it to be the "first" state because it was the first to form right after the Big Bang.
Energy is required to remove electrons from atoms in order to create plasma. Different types of energy, such as heat, electricity, or light, are possible (ultraviolet light or intense visible light from a laser). Plasmas combine back into neutral gas due to insufficient sustaining power.
Therefore the plasma state of matter exist in energized form and required energy to continue existing which can be provided by many source and form of energy.
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A net force of 75 pounds acts on a body of 25 slugs. The body is initially at rest. What is its acceleration during the action of the force?
The correct answer is 0.91 m/[tex]s^2[/tex].
The pace at which a body increases its velocity is what is meant by the phrase "acceleration." It always moves in the same direction as the body when it moves.
The acceleration of an object is equal to the net force exerted on it divided by its mass, or a = F m, in accordance with Newton's second rule of motion. When the mass of an item and the net force acting on it are known, the acceleration of that object can be determined using this equation for acceleration.
Force F = 75 ponds = 33.62 N
initial velocity y =0
mass m = 25 slungs = 364.848 kg
time t = 12s
Acceleration of the body,
Acceleration = F/m
Acceleration = 333.62/364.848
Acceleration = 0.91 m/[tex]s^2[/tex]
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How long does it take to drive at 8 m/s for 30 km (answer in seconds)
Answer:
60/80 x 30 = 1800/80 = 22.5 minutes. 22.5 minutes would be required to drive 30 km
Explanation:
1350 seconds
Which of the following statements are possibly true about an object that is accelerating?
I. It is slowing down
II. It is changing directions at a constant speed
III. It is changing directions while slowing down
Question 10 options:
I only
I, II, and III
I and III only
II and III only
Answer:
II and III only
Explanation:
All III of those are true
A man , standing on the top of Tower , throws vertically a ball , with initial velocity of 15 m/s. Assuming that, the coordinates of the inertial reference is attached to the hand of the man, such that the origin coincides with the center of his hand, a) What is the equation describing the motion of the ball
The equation describing the motion of the ball is determined as 15t + 4.9t².
What is equation of motion?This is the equation that describes the motion of an object is known as equation of motion.
The equation describing the motion of the ball is determined as follows;
y = vt + ¹/₂gt²
where;
y is the vertical height of fallt is the time of motiong is acceleration due to gravity = 9.8 m/s²y = 15t + 4.9t²
Thus, the equation describing the motion of the ball is determined as 15t + 4.9t².
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The circuit diagram below shows the locations of four switches. Which switch configuration creates a short circuit?
Answer:
A
Explanation:
When switches 1 and 2 are 'on' or 'closed' the circuit becomes a short