If a car travels 20 miles in 1 hour and 15 minutes, then the average speed of the car would be 7.15 meters/second.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.
As given in the problem, if a car travels 20 miles in 1 hour and 15 minutes, then we have to find the average speed of the car,
1 mile = 1609 meters
20 miles = 20*1609 meters
= 32180 meters
1 hour = 3600 seconds
1 minutes = 60 seconds
15 minutes = 15*60
=900 seconds
1 hour and 15 minutes = 4500 seconds
The average speed of the car = The distance traveled by car/time
= 32180 meters / 4500 seconds
= 7.15 meters / seconds
Thus, the average speed of the car would be 7.15 meters/second.
To learn more about speed from here, refer to the link;
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3.
A body starts moving from rest and attains the acceleration of 0.5 m/s2. Calculate the
velocity at the end of 3 minutes and also find the distance travelled by it during that
time.
Answer:
90 m/s
8100 m
Explanation:
Given:
v₀ = 0 m/s
a = 0.5 m/s²
t = 3 min = 180 s
Find: v and Δx
v = at + v₀
v = (0.5 m/s²) (180 s) + 0 m/s
v = 90 m/s
Δx = v₀ t + ½ at²
Δx = (0 m/s) (180 s) + ½ (0.5 m/s²) (180 s)²
Δx = 8100 m
if it takes 20 n to move an object 20m how much work was done
Answer:
[tex]\boxed{Work \: done = 400 \: N-m}[/tex]
Explanation:
Force = 20 N
Displacement =20 m
Work Done = Force × Displacement
= 20 × 20
= 400 N-m
Pleasssseeee helpppp i will mark brainlest
Answer:
the second and the third
Explanation:
the maximum daylight hours is the second, and the warmest temperatures for the northem hemisphere.
Question 1: A man trailing a trolley bag and suddenly, the wheels of the trolley bag get locked. The man realises that he has to put extra effort to drag the bag. The man finds it difficult to drag the bag because
Answer: Because of the friction force acting directly on the bag.
Explanation:
The function of the wheels is diminish the effect of the friction force, when the friction pulls back, it makes the wheel rotate, and this force is not applied directly on the bag.
Now the wheels are not working, so now the friction is acting directly on the bag, this is why the mand finds more difficult to drag the bag.
23 POINTS! Does the period of a pendulum depend on the mass? Explain
Answer:
The period of a pendulum does not depend on the mass of the ball, but only on the length of the string.
Explanation:
Two pendula with different masses but the same length will have the same period. Two pendula with different lengths will different periods; the pendulum with the longer string will have the longer period.
Which is a characteristic of all waves?
All waves carry energy.
All waves move through space.
All waves move through matter, from particle to particle.
All waves transfer energy parallel to the direction of wave mo
Answer:à
Explanation:waves carry energy in the direction in which they move
Characteristics of all waves:
All waves carry energy.
All waves move through space.
All waves move through matter, from particle to particle.
All waves transfer energy parallel to the direction of wave mo tion.
which atomic particle has no charge?
A. Electron
B. Neutron
C. Nucleus
D. Proton
Answer:
B. Neutron has no charge
Answer:
B. Neutron
Explanation:
Firstly, the nucleus is what contains the protons and electrons, so it is not an atomic particle. The electron has a negative charge, and the proton has a positive charge (you can remember this by looking at its prefix 'pro'). This means the neutron has no charge (think of it as neutral).
A 38.5 kg man is in an elevator
accelerating downward. A normal
force of 343 N pushes up on him.
What is his acceleration?
Answer:
F = m*(g - a) →
a = g - F/m = 0.891 m/s² downward
Explanation:
If elevator was stationary, the normal force of elevator floor on man* would be = mg
mg = (38.5)(9.81) ≈ 378 N.
If elevator is accelerating downward the floor is accelerating away from man and so the normal force will be less than man's weight by: 378 - 343 = 35 N.
Hope this helps.
Answer:
-0.891
Explanation:
negative because downward
An 82 kg jogger has 810 J of kinetic energy. What is the jogger’s velocity? 4.4 m/s 9.9 m/s 19 m/s
Answer:
4.4 m/s
Explanation:
KE = ½ mv²
810 J = ½ (82 kg) v²
v = 4.4 m/s
Answer:
4.4
Explanation:
got right on edg
To run the physics cart, the fan speed of the cart is manipulated. This is the (blank) variable. The cart accelerates due to the speed of the fan. Acceleration is therefore the (blank) variable. A "constant" is a parameter that stays the same regardless of the variables. One parameter of the cart that is held constant is the (blank) .
Answer:
A) Independent
B) Dependent
C) Mass
Explanation:
The speed applied to the physics cart is manipulated. This doesn't depend on another variable. Thus, speed is the (independent) variable.
The cart accelerates due to the speed applied to the cart. Acceleration depends on the speed applied. Thus, acceleration is therefore the (dependent) variable.
A “constant” is a parameter that remains the same regardless of the variables.
One parameter of the cart that is held constant is the (mass).
what is electrical power ???
Answer:
Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second.
Answer:
Explanation shown below.
Explanation:
Is one generated from the movement of free moving electrons.
Electric energy can be harnessed from different sources.
Please Hurry!! This is very simple!
What are your thoughts about the connection between exercise and memory? How often do you exercise? Do you exercise more or less now that you are no longer on campus? Is that a good or bad thing? Why?
Answer:
What are your thoughts about the connection between exercise and memory?
I think its important to memorize how much u work out and exersize. make sure u dont do it too much or u might pass out. keep track of ur health by memorizing what u ate and when u ate before doing a lot of movement. you might throw up. Exercising is obviously very important for your body.
How often do you exercise?
5 times a week. (5/7 days)
Do you exercise more or less now that you are no longer on campus? Is that a good or bad thing?
A little less. But i think its a good thing
Why?
I used to go to a gym near campus! But now some are a little farther but during this time of quarantine, i work out at home and do the basics like running and agility. I think its good because it teaches me the exercising i can do at home instead of getting memberships and using my money. now i can spend money wisely and still exersize.
Mark as brainliest!
hope this helps! :)
make any changes if ud like
Explanation:
state newtons second law of motion from the equation f: ma
Newton's Second Law of Motion states "The rate of change of momentum of a body is directly proportional to the applied unbalanced force in the direction of force".
What will happen if a spoon measuring 5 °C is placed into a glass of water measuring 20 °C?
A. Heat will move from the water to the spoon until the spoon reaches 20 °C.
B. Heat will move from the spoon into the water until both are balanced at 25 °C.
Heat will move from the spoon into the water until the temperatures of both are balanced
at 15 °C.
C.
D.
Heat will move from the water to the spoon until the temperatures of both are balanced
between 5 °C and 20 °C.
Answer:
d
Explanation:
What change occurs to the gravitational force of attraction between two bodies when the
distance between them is made half (1/2) by keeping masses constant?
Answer:
when the radius is halved, F becomes 4 times
Explanation:
The formula is given by
[tex]F = \frac{Gm1m2}{r^2}[/tex]
When r is halved:
[tex]F = \frac{Gm1m2}{(1/2r)^2}[/tex]
=> [tex]F = \frac{Gm1m2}{1/4 r^2}[/tex]
=> [tex]F = 4(\frac{Gm1m2}{r^2} )[/tex]
This means when the radius is halved, F becomes 4 times
An atom of xenon has a mass number of 127 amu. How many neutrons
does it contain? *
Answer:
73 neutrons.
Explanation:
Data obtained from the question:
Mass number of Xenon = 127.
Neutron number =...?
We can obtain the number of neutron present as follow:
Atomic number of Xenon = 54
Recall:
Atomic number = proton number = 54
Mass number = proton + neutron
127 = 54 + Neutron
Neutron = 127 – 54
Neutron = 73.
Therefore, 73 neutrons are present in the Xenon atom.
Which object has more gravitational potential energy
Answer:
need more context
Explanation:
Answer:
EL QUE TENGA MÁS MASA Y MÁS ALTURA.
Explanation:
Compare and contrast speed, velocity, and acceleration. Why do their differences matter?
Answer:
Speed is a scalar quantity, that is, it is a number and indicates how fast (or slow) one travels at any given time.
Velocity is a vector quantity, this means that it has magnitude and direction, that is, how fast an object travels and its where its going (speed + the direction in which the object moves).
Acceleration is the ratio of the velocity change over the time interval in which this velocity change occurred. Acceleration as well as velocity is a vector quantity so it is made up of magnitude and direction.
The differences between these three quantities are important for the description of the movement. In the case of speed and velocity, its difference lies in the fact that velocity indicates the direction in which the movement is taking place (and speed is only a number), which in many physical phenomena the direction of movement is an important property. And the difference between acceleration and velocity is that acceleration instead of a velocity indicates a change in velocity (either in magnitude, direction or both), which tells us how fast a velocity will increase or decrease over time.
The law of motion that states that an object's acceleration is directly related
to the net force applied and inversely related to the mass of the object is
Answer:
Newtons 2nd law
F = ma
Explanation:
Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
When a solid compound dissolves in water
Answer:
The solid separates and disperse uniformly throughout the solution.
A family has husband wife and three children A B and C the present age of husband is 5 years more than the vice president age the vice president age is twice the present age of a the present age of a is 12 years more than the present age of B 20 present age is one and a half times the present age of see if she is 12 years old at present what is the present age of husband's friend Ram who is 15 years younger than the husband
Answer:
38 years old.
Explanation:
So, we are given the following data or parameters or information which is going to assist us in solving this particular Question;
1=> The three children are A, B and C respectively.
2=> "the present age of husband is 5 years more than the wife's age."
3=> " the wife's age is twice the present age of A"
4=> the present age of A is 12 years more than the present age of B "
5=> B's present age is one and a half times the present age of C .
6=> "if C is 12 years old at present "
7=> "husband's friend Ram who is 15 years younger than the husband"
We will start from point 5 above that is to say;
B = C × 3/2. = 12 × 3/2 = 6 × 3= 18.
Also, A = 12 + B = 12 + 12= 24.
From the point 3 Above; the wife's age= 2 × A= 2 × 24 = 48 years of age.
From the point 2, we have that the husband's age = 5 + 48 = 53 years of age.
Thus, the present age of husband's friend, Ram who is 15 years younger than the husband = 53 - 15 = 38 years old
Francium-233 has a half-life of 22 minutes.A Geigor counter gives a reading of 58 counts per minute (cpm) from a sample of francium-233.What will the reading be 22 minutes later?You can ignore background radiation
Answer:
The reading of the Geiger counter, 22 minutes later = 29 counts per minute (cpm)
Explanation:
Half life is defined as the time taken for the amount ( or activity) of a substance to reduce to half its original value.
As stated in the question, the half life of Francium-233 is 22 minutes, [tex]t_{1/2} = 22 minutes[/tex]. This means that it takes 22 minutes for the activity of Francium-233 to reduce to half of its original value.
The original activity of Francium-233 = 58 counts per minute (cpm)
By the end of 22 minutes, the activity measured by the counter would have halved.
Activity of Francium-233 after 22 minutes = 58/2
Activity of Francium-233 after 22 minutes = 29 counts per minute (cpm)
Give two examples of spatial interference which can be easily observed. Small explanation of each object please, just so I can understand.
Answer:
Spatial interference describes the correlation between waves at different points in space.
The two example of spatial interference are as following:
alphanumeric characters can be easily identified in isolation but difficult to be identified when these characters are surrounded by optotypes because visual acuity will be reduced by crowded conditions that limit resolution at several stages of visual processing.Birds are able to identify visual target slowly that are presented at the top than to that same visual target presented at the bottom.Hence, different waves in a space correlate result into Spatial interference.
if a ray of light is incident on plane mirror at an angle of 300 its angle of reflection is.
Answer:
300°
Explanation:
both the angles of incidence and reflection are the same
A 2.0 g ball with a +0.05 C charge is moved from the negative plate to the positive plate, and then is released. The potential difference between the plates is 12.0V. When the ball strikes the (–) plate its velocity is most nearly equal to
Answer:
24.5 m/s
Explanation:
Since the work done by the electric field on the charge equals the kinetic energy of the ball, then
qV = 1/2mv²
and v = √(2qV/m)
where q = charge = + 0.05 C, V = potential difference = 12.0 V, m = mass of ball = 2.0 g = 0.002 kg
Substituting the values into v, we have
v = √(2 × + 0.05 C × 12.0 V/0.002 kg)
= √(1.2 CV/.002 kg)
= √(600 CV/kg)
= 24.5 m/s
Dynamo converts the
a》mechanical energy into electrical energy
b》chemical energy into electrical energy
c》heat energy into electrical energy
d》none of the above
Answer:
[tex] \gamma \: dynamo \: converts \: the \: mechanical \: energy \: into \: electrical \: energy \: .[/tex]
Explanation:
Hope it helps you :)))
Answer:
.
Explanation:
Which statements describe how a machine can help make work easier? Select two options.
It can put out more force than the input force by decreasing the distance through which force is applied.
It can increase the amount of work performed if the output force is in the same direction as the input force.
It can apply a force to an object in a different direction than the force applied to the machine.
It can increase the distance through which a force acts by exerting less force than was used on it.
It can exert a greater force through a greater distance than the force used on the machine.
Answer:
It can put out more force than the input force by decreasing the distance through which force is applied.It can apply a force to an object in a different direction than the force applied to the machine.Explanation:
Assuming the machine is a simple machine, such as a lever or pulley, the machine will not do any more work than is put into it. However, it can change the magnitude or direction (or both) of the input force required to achieve a particular output force.
Because the machine does not increase the work done, if the output force is greater, the output distance must be less.
The applicable observations are ...
It can put out more force than the input force by decreasing the distance through which force is applied.It can apply a force to an object in a different direction than the force applied to the machine.
Un tubo metálico tiene 100 metros de longitud cuando está a 0 oC y 100,13 metros cuando se calienta hasta 100 oC. ¿Cuál es el coeficiente de dilatación del material?
Answer:
α= 1.3 10-5 ºC⁻¹
Explanation:
La dilatación termica de los cuerpos esta dada por la relación
ΔL = L₀ α ( T -T₀)
en este caso nos piden el coeficiente de dilatación térmica
α =DL/L₀ DT
calculemos
α = ( 100,13 -100)/[100 (100 – 0)]
α = 1,3 10-5 ºC⁻¹
Traduction
The thermal expansion of bodies is given by the relationship
ΔL = L₀ α (T -T₀)
in this case they ask us for the coefficient of thermal expansion
α = ΔL / L₀ ΔT
let's calculate
α = (100,13 -100) / [100 (100 - 0)]
α= 1.3 10-5 ºC⁻¹
Answer!!!!!!!!!!!!!!!!!!!!
Acceleration =change in velocity÷Time taken
or, Acceleration =final velocity-Initial velocity÷Time taken
or, a=v-u÷t
or, at=v-u
or, v-u=at
therefore, v=u+at
The image shows a man on a cliff. What type of energy does he possess?
1 point
Answer:
potential energy
Explanation:
