Answer:
Scalar quantity
Vector quantity
Explanation:
A scalar quantity is a quantity that is fully described by magnitude alone. Examples include; mass, temperature etc
A vector quantity is described by both magnitude and direction. E.g force, weight etc
A student conducts an experiment in which an object travels across a horizontal surface while for 2 s a net force is applied to a 2 kg object that initially travels with a speed of 0.5 m/s. Data collected from the experiment are used to create the graph of the magnitude of the applied force exerted on the object as a function of time is shown. All frictional forces are considered to be negligible. Can the student use the graph and the known data to determine the momentum of the object after the force has been applied?
Yes, because the average force exerted on the object can be used with the time interval of 2 s to determine the change in momentum of the object by using Δp⃗ =F⃗ Δt.
Yes, because the area bound by the best-fit line and the horizontal axis from 0 s to 2 s can be used to determine the change in momentum of the object.
No, because the data is too scattered to determine the average force that is exerted on the object.
No, because the student needs to know the direction that the force is applied to the object because the applied force will be in the same direction as the change in momentum of the object.
Answer:
D. No, because the student needs to know the direction that the force is applied
Explanation:
The change in momentum depends on the direction of the force as well as its magnitude. Since the graph only supplies force magnitude information, it is insufficient to allow the student to calculate the change in momentum.
A car travels for 10s at a steady speed of 20m/s along a straight road. The traffic lights ahead change to red, and the car slows down with a constant deceleration, so that it stops after an additional 8 seconds.
Use your graph to deduce how far the car has travelled during the 18 seconds described.
Answer:
280 meters
Explanation:
You should get the speed
And you should use the graph….
To get the distance using the graph the rule is …(area under graph) which is equal to area of triangle + area of the rectangle
Area of triangle = 0.5 x length x width
Area of rectangle = Length x width
(0.5 x 8 x 20 ) + ( 10 x 20 ) = 280 meters
Wish this helps
Convert 1 mm to meters using scientific notation. Include units in your answer.
Answer: The answer in scientific notation with the unit included is (1 × 10^-3m.)
Explanation:
In the field of physics, when working with too large or too small numbers, such can be expressed with the use of scientific notation. This helps to eliminate huge or ambiguous numbers with significant units. It is written is such a way that the first number is greater than or equal to 1 and less than 10 which is then multiplied by a factor of 10.
Units are symbols that are used to represent a measurement For example the unit of meters is (m).
Converting 1mm to m:
1000millimeters = 1meter
1 millimetre = X
Making X the subject of formula,
X = 1 ×1 /1000
X = 0.001m
Therefore expressing X in scientific notation is
1 × 10^-3meter (m)
A 50.0 kg shell is fired from a cannon on Earth's surface to a maximum height of 400 m. It then falls to a height of 100 m. What is the loss of potential energy as it falls?
Answer:
150,000 Joules.
Explanation:
Given that a 50.0 kg shell is fired from a cannon on Earth's surface to a maximum height of 400 m. It then falls to a height of 100 m. What is the loss of potential energy as it falls?
From Potential energy formula,
P.D = mgh
Assuming g = 10m/s^2
P.D = 50 × 10 × 400
P.D = 200000 Joules
Then it fell on 100m
The potential energy will be
P.D = 50 × 10 × 100
P.D = 50000 Joules
The lost Potential energy will be:
Lost P.D = 200000 - 50000
Lost P.D = 150000 Joules
Therefore, the loss of potential energy as it falls will be 150,000 Joules.
Thanks+BRAINLIST
Light refracts when:
a. It changes speed
b. It changes from a particle to a wave
C. Its density changes
d. It encounters a solid object
Answer:
it change speed
Explanation:
its because when light passes through one medium to another (rarer to denser)its velocity change and its speed also changes
3 A jet fighter has a mass at take-off of 28 000 kg.
a)Its engines produce a force of 70 000 N. What
is its acceleration?
b) What is its acceleration if the force from the
engine is increased to 120 000 N?
Answer:
A. 2.5 m/s²
B. 4.29 m/s²
Explanation:
A. Determination of the acceleration.
Mass (m) = 28000 Kg
Force (F) = 70000 N
Acceleration (a) =?
Force (F) is simply defined as the product of mass (m) and acceleration (a). Mathematically, it is expressed as:
Force (F) = mass (m) × acceleration (a)
F = ma
Divide both side by m
a = F / m
With the above formula, we can obtain the acceleration as follow:
Mass (m) = 28000 Kg
Force (F) = 70000 N
Acceleration (a) =?
a = F / m
a = 70000 /28000
a = 2.5 m/s²
B. Determination of the acceleration.
Mass (m) = 28000 Kg
Force (F) = 120000 N
Acceleration (a) =?
a = F / m
a = 120000 /28000
a = 4.29 m/s²
An object has an acceleration of 6 m/s/s. If the net force
was tripled and the mass were halved, then the new
acceleration would be m/s/s.
Answer:
[tex]F = ma \\ a = \frac{F}{m} = 6 \\ when \: force \: is \: trippled \: and \: mass \: is \: halved \\ a = \frac{3F}{ \frac{1}{2} m} = \frac{3}{2} \times 6 \\ a = \frac{(3 \times 6)}{2} \\ a = \frac{18}{2} \\ a = 9 \: m {s}^{ - 2} [/tex]
An isotope has a half-life of 25 days. If you start with 50 grams, how much of the substance
will remain after 50 days? *
25 grams
12.5 g
6.75 g
Answer:
12.5
Explanation:
If the half life is 25 days then in 50 days it will half twice
50/2=25
25/2=12.5
3. An element that is malleable is
A. Easily shaped B. Very hard C. Difficult to pour D. Very dense
Answer:
Difficult to Pour.
Explanation:
Some gas is trapped in a large syringe by a piston.The atmospheric pressure is 100kpa.The pressure gauge indicates that the gas pressurr is 200kpa above atmospheric pressure.The piston moves outwards and the volume of the gas doubles.The temperature remains constant.What is the new gas pressure?
Answer: The new gas pressure is 150 kPa.
Explanation :
Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}[/tex] (At constant temperature and number of moles)
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = (100+200) kPa = 300 kPa
[tex]P_2[/tex] = final pressure of gas = ?
[tex]V_1[/tex] = initial volume of gas = v
[tex]V_2[/tex] = final volume of gas = 2v
[tex]300\times v=P_2\times 2v[/tex]
[tex]P_2=150kPa[/tex]
Therefore, the new gas pressure is 150 kPa.
Saeed moves 50 m east then 65 m south to reach the garden. What is the displacement of Saeed?
Answer:
82.01m
Explanation:
Using the formula:
R^2=A^2+B^2
R= √ A^2+B^2
Where R= displacement
A=50m
B=65m
R= √ 50^2+65^2
R= √ 2500+4225
R= √ 6725
R=82.01m
How far does a horse travel if it gallops at an average speed of 15km/hr for 2 hours?
Answer:
30km
Explanation:
Distance= speed x time
15x2=30km
5. Susan exerted 400 newtons of force while pushing on a huge boulder. The boulder moved 0 meters. Calculate work.
Answer:
0 J
Explanation:
Work is the product of force and distance in the direction of force.
The formula is ; Work = Force * Distance
Given that :
Force = 400 N
Distance = 0 meters
Work = 400 * 0 = 0 J
No work was done because the boulder did not move.
A substance has a boiling point of 220 degrees Celsius and a melting point of −120 degrees Celsius. What state will it be at room temperature?
The substance with a boiling point of 220°C and a melting point of -120°C will be liquid at room temperature. The room temperature ranges from 15-35°C.
What is state of matter?The state of matter is the behavior of atoms and molecules present in a substance at a particular condition. There are three states of matter which include:
a. Solids: These are relatively rigid with a definite volume and shape, the atoms and molecules are attached to each other and vibrate in place,
b. Liquids: These are fluid in nature with a definite volume but not a definite shape, atoms and molecules are attached to each other by chemical bonds, and have more energy than solids,
c. Gases: In this state molecules do not have a definite shape nor a definite volume, the molecules are unstable as they carry maximum energy.
Boiling point of a substance is the temperature at which the vapor pressure of the liquid becomes equal to the pressure of surrounding (atmospheric pressure) of the liquid and the liquid therefore changes into the vapor state.
The process by which a solid substance changes to a liquid substance is called melting. The melting point is the temperature at which melting of a solid into a liquid takes place. The melting point of a substance is the same as the freezing point.
Learn more about Matter here:
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A smooth wooden block is placed on a smooth wooden tabletop. You find that you must exert a force of 22.0 N to keep this 7.00 kg block moving at a constant
velocity of 4.00 m/s. What is the gravitational force acting on the wooden block?
A.) 7.00 N
B.) 68.7 N
C.) 22.0 N
D.) 78.5 N
Answer:
B . 68.7 N
Explanation:
Given in the question that;
Force = 22 N
Mass = 7.0 kg
Velocity = 4.0 m/s
Gravitational force is the weight of wooden block , calculated as mass times acceleration due to gravity.
F= m* a
F= 7 * 9.81
F= 68.67 N
F= 68.7 N
Identify at least two ways in which heavy rain can affect the efficiency of
waste water treatment facilities.
I
The property of our eyes that makes us perceives a rotating coloured disc as white.
A weightlifter lifts a set of 1250kg weights a vertical distance of 2m weight lifting contest. what potential energy do the weights now possess
Answer: The potential energy of the weights is 24,500 J
Explanation:
For an object of mass M, that is at a distance H from the ground, the potential energy can be written as:
U = M*H*g
where g is the gravitational acceleration g = 9.8m/s^2
In this case, we have that:
mass of the weights = 1,250 kg
height = 2m
Then the potential energy of the weights is:
U = 2m*1,250kg*9.8m/s^2 = 24,500 J
found at the higher frequency end of the radio spectrum, but they are commonly distinguished from radio waves because of the technologies used to access them
what wave is this called
Answer:
stealing my points back
Explanation:
Which three statements about gravity and the formation of the solar system
are true?
A. Gravity pulled most of the matter into the center of the solar
system.
B. Gravity caused the planets and Sun to have spherical shapes.
O C. Gravity held the pieces of forming planets together.
D. Gravity evenly distributed matter throughout the solar system.
Answer:
it's answer is B
A planet is round because of gravity. A planet's gravity pulls equally from all sides. Gravity pulls from the centre to the edges like the spokes of a bicycle wheel. This makes the overall shape of a planet a sphere, which is a three -dimensional circle
Hope it helps you
You get points!! IMPORTANT
A DUI manslaughter charge is more serious than a vehicular manslaughter charge.
A. True
B. False
Answer:
A
Explanation:
Answer:True.
Explanation:
If charged with DUI Manslaughter it is 1. A DUI charge and then can be moved to vehicular manslaughter sooo thats more charges is how I see it.
Figure 1 shows an astronaut working with the lunar research module on the
surface of the Moon. The mass of the lunar module is 15.000kg. The gravitational
field strength of the Earth is 10N/kg.
Figure 1
(a) Calculate the weight of the lunar module on the Earth. Give your
Answer:
The weight of the lunar research module on Earth is 150.000 N
Explanation:
The given parameters for the mass of the lunar module are;
The mass of the lunar moon, m = 15.000 kg
The gravitational field strength of the Earth, g = 10 N/kg
The weight, 'W', of the lunar research module on Earth is given as follows;
W = m·g
Substituting the known values, we get;
W = 15.000 kg × 10 N/kg = 150.000 N
The weight of the lunar research module on Earth, W = 150.000 N.
The fulcrum is the
point of support on which a lever rotates.
force opposing the applied force.
distance an object moves when doing work.
stored energy of an object.
Answer:
point of support on which a lever rotates.
Explanation:
The fulcrum is the point of support on which a lever rotates. Fulcrum is a pivotal part of simple machines.
The fulcrum provides the platform for a lever to torque.
The force that opposes motion by the applied force is termed the frictional force. Friction is a force that opposes motion. The stored energy of an object is its potential energy. The potential energy is the energy due to the position of a body. The distance an object moves when doing work is termed its displacement.4. A wave with a frequency of 30 Hz has a wavelength of 5 meters. At what speed will the
wavelength travel?
Answer:
6 m/s
Explanation:
Describe the disadvantages and advantages of using this element for dating.
Answer:Each method of dating has constraints around its use and effectiveness. Not all methods are well-suited for each situation – and sometimes it is just not possible to use a particular dating method.
Examples of some of the constraints of using a dating method include:
the size of the sample
the type of sample
contamination of the sample
the type of associated geo-archaeological materials
the need to minimise destructive testing
the chronologies involved
Explanation:
Why is studying the Earth important? What advantage is the
study of the Earth to all scientists?
Answer: It is important to study Earth because it is the one place in the entire solar system where humans can live. Earth is a planet too! The advantage is Earth science or geoscience includes all fields of natural science related to planet Earth. This is a branch of science dealing with the physical and chemical .
quote explanation: I hope that was helpful and please mark me as brainliest!
A train travels 200km/hr. how much distance will the train be from the station in 2.5 hours?
Answer:
500km
Explanation:
Given parameters:
Speed = 200km/hr
Time taken = 2.5hrs
Unknown:
Distance = ?
Solution:
To solve this problem, we use the speed, time and distance equation.
Therefore;
Distance = Speed x time
So;
Distance = 200 x 2.5 = 500km
The high point on a wave is called its _________
Answer:
I believe its called the crest
Explanation:
Answer:
crest
Explanation:
the highest surface is called crest. the lowest is the trough. the vertical distance between the crest and trough is the wave height. the horizontal distance between two adjacent crests or troughs is known as the wavelength.
Someone please help me
I have attached the question
Answer:
Hydrogen
Explanation:
The atomic number is the number of protons in the nucleus :)
A rolling ball with a mass of 1.01 kg crashes into a wall. The wall exerts a force of 2.40 Newtons and stops the ball. What was the magnitude of the acceleration of the ball at the time of the crash?
Answer:
Acceleration, a = 2.38m/s²
Explanation:
Given the following data;
Mass = 1.01 kg
Force = 2.4N
To find the acceleration;
Force is given by the multiplication of mass and acceleration.
Mathematically, Force is;
[tex] F = ma[/tex]
Where;
F represents force.m represents the mass of an object.a represents acceleration.Making acceleration (a) the subject, we have;
[tex]Acceleration, a = \frac{F}{m}[/tex]
Substituting into the equation, we have;
[tex]Acceleration, a = \frac{2.4}{1.01}[/tex]
Acceleration, a = 2.38m/s²
Therefore, the magnitude of the acceleration of the ball at the time of the crash is 2.38 meters per seconds square.
