Answer:
A.) 8 seconds
B.) 16 seconds
C.) 48 m
Explanation:
Given that a cyclist traveling at constant speed of 12 m/s
and the bus accelerates uniformly at 1.5ms²
A.) The bus has the following parameters
Acceleration a = 1.5 m/s^2
Initial velocity U = 0. Since the bus is starting from rest.
Final velocity V = 12 m/s
Use equation one of linear motion.
V = U + at
Substitute V, U and a into the formula
12 = 0 + 1.5t
1.5t = 12
t = 12/1.5
t = 8 seconds
Therefore, the bus reach the same speed as the cyclist at 8 seconds.
B.) For the cyclist moving at constant speed, acceleration a = 0. Using second equation of motion
h = Ut + 1/2at^2
Since a = 0, the equation is reduced to:
h = Ut.
Also, for the bus,
h = Ut + 1/2at^2
Equate the two equations since the h is the same
Ut = Ut + 1/2at^2
Substitute all the parameters into the formula
12t = 0 + 1/2 × 1.5t^2
12t = 0.75t^2
0.75t = 12
t = 12/0.75
t = 16 seconds
Therefore, the bus takes 16 seconds to catch the cyclist
C.) Use third equation of linear motion.
V^2 = U^2 + 2as
Where s = distance
Substitute V, U and a into the formula
12^2 = 0 + 2 × 1.5 S
144 = 3S
S = 144/3
S = 48 m
A car has a mass of 8000 kg and a kinetic energy of 24,000 J. What is its
speed?
A. 1.7 m/s
B. 2.4 m/s
C. 6 m/s
D. 3 m/s
Answer:
2.4
Explanation:
48,000/8000=6
square root of 6 = 2.44948974278
so 2.4
AnswerB.2.4m/s
Explanations;
24000=1/2×8000×v^2
24000/4000=v^2
√ 6.=v
v=2.4
Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal? increasing the inertia of the car decreasing the reaction force increasing the action force decreasing the mass of the car Mark this and return
Answer:
d. decreasing the mass of the car
Explanation:
Engineers are trying to improve race cars. Their goal is to increase the acceleration of the car using the same engine, it can be achieved by decreasing the mass of the car, therefore the correct answer is option C.
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
As given in the problem Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine,
The acceleration of the car can be increased by decreasing the mass of the car assuming the engine of the car is producing the same amount of force.
Thus, the acceleration can be increased by decreasing the mass of the car, therefore the correct answer is option C.
To learn more about Newton's second law, here refer to the link given below ;
brainly.com/question/13447525
#SPJ6
Waves that collide with a barrier will reflect at an angle equal to the angle of incidence.
True
False
Answer:
True
Explanation:
This is a fundamental concept in physics dealing with the nature of waves where when the waves collide with a barrier such as wall or some form of surface will reflect at an angle equal to the angle of incidence.
HELP!!!!!!!!!!!! i will mark you brainliest!!!!!!!!!!!!!!!!!!!!!! Which type of agricultural product uses the LEAST amount of water to produce? A lamb B vegetables C beef D fruits
Answer:
your anwser should be B- vegetables.
Plz Help me with this ?
Answer:
the answer is c part.
Explanation:
hope it helps.
Answer:
The answer is C How many times the heart beats in one minute.
Which of the following is a personal decision that involves science A)It is immoral to cheat on your homework? B)what movie will I like the most this weekend? C)will an air purifier reduce the dust in my house? D)is $100 a reasonable price for a cell phone?
Answer:
C because air purifier is very essential in dusty homes .
Answer:C
Explanation: The answer is C because an air purifier purifies the air in your room which is science.
What happens to the gravitational force between two objects as the distance between them decreases?
Answer:
gravitational force increases
Explanation:
Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are brought closer to each other, the force of gravitational attraction between them also increases.
Please answer this question
Answer:
Volume of the tank = 3m³
Mass of total water = 3,000 kg
Explanation:
Given:
Measurement of tank = 2m × 1.5m × 1m
Density = 1,000 kg/m³
Find:
Volume of the tank.
Mass of total water.
Computation:
⇒ Volume of the tank = lbh
Volume of the tank = 2m × 1.5m × 1m
Volume of the tank = 3m³
⇒ Mass of total water = Volume of the tank × 1,000 kg/m³
Mass of total water = 3m³ × 1,000 kg/m³
Mass of total water = 3,000 kg
Answer:
length x width x height = volume
2 x 1.5 x 1 = 3m
3m^3 is the volume
1000 km/ m^3 x 3m^3 = 3000^3 km
Hope this helps
Explanation:
A camera lens focuses on an object 75.0 cm from the lens. The image forms 3.50 cm behind the lens. What is the magnification of the image?
Answer:
The answer is -.047.
Explanation:
Solved by taking -3.5 over 75. Correct on Acellus.
What is the slope of the line plotted below?
A. 1
B. -2
C. 2
D.-1
Answer:
B. -2
Explanation:
Since the line is coming from the top left to the bottom right, you know the line is going to be negative.
If you take two points, so (0,1) and (1,-1), and use the formula y2-y1/x2-x1, after substitution you should get -1-1/1-0. If you simplify, the answer should be -2/1 or -2.
A pushing force of 12 N is applied on a box for 32 ms. What is the magnitude of the impulse of this force?
Answer: magnitude of the impulse of this force is 0.384 Ns
Explanation:
Given the following :
Pushing force (F) = 12N
Duration of the force = time (t) = 32ms, hence, time = 32 × 10^-3 seconds
The impulse of a body is given by the product of the force and the duration of the applied force ;
Therefore impulse = F × t
Impulse = 12 (N) × (32 × 10^-3) (s)
Impulse = 384 × 10^-3
Impulse = 0.384 Ns
what are AR,L,K in the periodic table
Answer:
Argon, Lithium and Potassium
Explanation:
Answer:
AR=Argon, L=Lithium K=Potassiaum
Explanation:
when taking a shower are girls suppose to wipe front to back ?
Answer:
Explanation:
I don't think it matters while taking a shower, however, while using the restroom, it is especially encourgaed to wipe front to back. The reasoning behind this is to prevent UTI's that are transferred by fecal particles and bacteria from the anus into the vagina. Hope this helps:)
Why is this equation wrong?
Answer:
It is not possible to find the square root in such a way
Explanation:
Which of the following is an example of heat convection?
Answer:
Liquid inside a beaker on a hot Bunsen burner circulates and heats through constant motion.
Explanation:
Transmission of heat by convection requires the movement of a liquid or gas. An example would be liquid in a beaker heating up as hot and cold parts of the liquid constantly circulate, which further heats the liquid. Heat from the sun is considered radiation, and the other two answers are examples of conduction.
How is an ammeter connected to a circuit?
Answer:
Ammeter- It is an instrument use to measure the amount of current passing through the circuit.
In a circuit an Am-meter is connected in series with the device to measure its current.
A 24.8 tall object is placed in front of a lens, which creates a -3.09 cm tall image. What is the magnification?
Answer: 0.125
Explanation:
Given that the
Object height U = 24.8 cm
Image height V = 3.09 cm
Magnification M is the ratio of the image height to the object height. That is, divide the given image height by the given object height.
M = V/U
Substitute V and U into the formula above.
M = 3.09/24.8
M = 0.125
Magnification is therefore equal to 0.125 approximately
Answer:
-0.125.
Explanation:
The previous explanation is right except for that it doesn't take into account that the -3.09 is negative – therefore, the positive answer is incorrect.
-0.125 is correct on Acellus.
The diagram illustrates the evolution of the universe, starting from the big bang. Each concentric circle represents a stage in the evolution as stated by the big bang theory. The arrows illustrate the changes that happened after the big bang and leading up to the stage where gases were formed that later led to the formation of stars and galaxies. Choose the inaccurate statements on the diagram.
Answer: The two correct answers are Universe became more dense and universe became less transparent.
Explanation: I took the test and those are correct
The incorrect statements on the diagram universe became more dense Universe became less transparent.
What is the universe?The universe is the whole cosmic system of matter and energy. The Earth, the Sun, the Moon, the planets, and the stars along with the dust, gases, and rocks form the universe.
The big bang is the theory that explains how the universe began. It says that the universe began with just a single point. It went on expanding and stretched to grow as large as possible. It is still now expanding.
The diagram (attached) illustrates the evolution of the universe, starting from the big bang. Each concentric circle represents a stage in the evolution as stated by the big bang theory.
Thus, the inaccurate statements on the diagram universe became more dense Universe became less transparent.
Learn more about the universe.
https://brainly.com/question/9724831
#SPJ5
Compute the conductivity of a conductor with a length of 2.0 cm and a cross-sectional area of 0.060 cm2, whose conductance is 3.5 x 103 ohms. σ = _____ ohm-1cm-1 A: 1.2 x 10 5 B: 2.9 x 10 -4 C: 1.1 x 10 2 D: 1.9 x 10 6
Answer: A
Explanation:
You are given the following parameters:
Length L = 2.0 cm and
cross-sectional area A = 0.060 cm^2
Conductance = 3.5×10^3 ohms
Conductance is a reciprocal of resistance R
Conductance = (σ × A)/L
Where σ = conductivity
Substitutes all the parameters into the formula
3.5×10^3 = (0.06 × σ)/2
Cross multiply
7×10^3 = 0.06σ
Make σ the subject of formula
σ = 7000/0.06
σ = 116666.67 ohm-1cm-1
σ = 1.2 ×10^5 ohm-1cm-1 approximately
Answer:
1.2 ×10^5
Explanation:
The degree to which a liquid resists flowing is called _____.
Answer:
Viscosity is a measure of how much a liquid resists flowing freely.
Answer:
velosity is the anser
Explanation:
sorry for the spelling
This is an example of A) alpha decay B) beta decay C) gamma decay D) half-life decay
Answer:
The answer is option A.
alpha decay
Hope this helps
A box having a mass of 0.2 kg is dragged across a horizontal floor by
means of a rope tied on the front of it. The coefficient of sliding friction
between the box and the floor is 0.2. If the angle between the rope and
the floor is 15º, what force must be exerted on the rope to move the box
at constant speed.
you can check attachment for answer.
kind regards
A force of 0.385 N must be exerted on the rope to move the box at a constant speed.
What is kinetic friction?Kinetic friction can be explained as a force that applies between moving surfaces of objects. A body moving on the surface will experience a force in the opposite direction. The friction force will depend on the coefficient of kinetic friction between the two bodies.
The mathematical expression of the kinetic friction can be represented as:
F = μ N
where 'μ' represents the coefficient of Kinetic friction.
Given, the mass of the box, m = 0.2 Kg
The coefficient of friction, μ = 0.2
The angle, θ = 15°
From the second law of motion:
F = ma
Fcosθ - f = 0
Fcosθ = μ N
[tex]\displaystyle F =\frac{\mu mg}{cos\theta + \mu sin\theta}[/tex]
[tex]\displaystyle F =\frac{0.2\times 0.2\times 9.8}{cos15 + 0.2 sin15}[/tex]
F = 0.385 N
Therefore, the force exerted is equal to 0.385 N.
Learn more about kinetic friction, here:
brainly.com/question/14111192
#SPJ2
PLS ANSWER (SCIENCE QUESTION) I WILL MARK U AS THE BRAINLIEST!!! PLS ANSWER REALLY EASY!!
Q1. Fill in the blanks:
1. __________________ are the building blocks of matter.
2. Each ________________ has a chemical symbol.
3. ________________ is used in oxy- acetylene flame for welding.
4. Noble gasses are also called __________________.
5. Dimitri Ivanovich Medeleeve arranged the elements systematically in _______________
6. Elements are the simplest kind of __.
7. Metals have __ melting and boiling points.
8. As you move from the left side of the periodic table to the right side, the elements become __________ .
Answer:
1. Atoms
2. element
A space capsule having a mass of 9.0×10^2 kg is projected vertically upwards from the Earth’s surface with an initial kinetic energy of 7.0×10^9 J. With no air resistance, determine the maximum distance from the center of the Earth attained by the capsule.
Answer:
7.3 x 10^6 m
Explanation:
What is the resultant force?
8 NA
14 N
3N
3N
22 N
Answer:
option will be ''B'' 0N
Explanation:
There are two forces acting upward 8N and 14N which is equal to 22N(upward force)
since, 22N is also acting downwards
both the forces will cancel each other and the the outcome will be zero.
Now, there is a 3N force acting on the left and right. So, they too, will cancel each other and the result will be zero.
In simple words, the box won't move in any direction Since it's being pulled with equal strength from all sides.
hope this helps
What type of quantity is momentum?
It is a scalar quantity because it involves magnitude only.
It is a vector quantity because it involves magnitude only.
It is a scalar quantity because it involves magnitude and direction.
It is a vector quantity because it involves magnitude and direction.
Answer: It is a vector quantity because it involves magnitude and direction.
Explanation:
momentum has magnitude and direction
Magnitude is a Scalar quantity
direction is a vector quantity
scalar times a vector is a vector
The type of quantity momentum has is that of a vector and it is denoted as option D.
What is a Vector quantity?
This is the type of quantity which has magnitude and direction present in it and momentum has the both.
The formula is mass × velocity in which velocity is a vector quantity which makes it that too.
Read more about Momentum here https://brainly.com/question/25121535
#SPJ2
Which method is used to separate parts of a solution when the entire solution can pass through a filter?
Answer:
Straining method
Explanation:
Straining method is the method that can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter.
Which is not a compound?Which is not a compound? water gold sugar silicon dioxide
Answer:
gold, silicon
Explanation:
i think this is the write answer
Answer:
Gold is not a compound
Explanation:
What is the mechanical advantage of the simple machine pictured?
A. 8.3
B. 14.7
C. 1.9
D. 20.4
Answer:
[tex]D.\ 20.4[/tex]
Explanation:
The simple machine in the attachment is a screw; so, I'll list the given parameters using related terms
Given
Radius of the screw (r) = 2.6m
Pitch (P) = 0.8m
Required
Calculate the Mechanical Advantage (M.A)
M.A is calculated as thus;
[tex]MA = \frac{2\pi r}{P}[/tex]
Substitute 2.6 for r; 0.8 for P and 3.14 for [tex]\pi[/tex]
[tex]MA = \frac{2\pi r}{P}[/tex]
[tex]MA = \frac{2 * 3..14 * 2.6}{0.8}[/tex]
[tex]MA = \frac{16.328}{0.8}[/tex]
[tex]M.A = 20.41[/tex]
From the list of given options, the approximated answer is D. 20.4
How many electrons do carbon and oxygen share
Answer:
1
Explanation:
To satisfy the Octet Rule, Carbon needs 4 more valence electrons. Since each Oxygen atom has 3 lone pairs of electrons, they can each share 1 pair of electrons with Carbon; as a result, filling Carbon's outer valence shell
Answer:
The Answer Is 4!!
Explanation:
Hope This Helps:)))