Answer:
[tex]\huge\boxed{\sf Average\ speed = 16\ km/hr}[/tex]
Explanation:
Given:
Distance = S = 8 km
Time = t = 30 minutes = 30/60 = 0.5 hours
Required:
Average Speed = ?
Formula:
Average speed = total distance covered / total time taken
Solution:
Average Speed = 8 / 0.5
Average speed = 16 km/hr
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807Harry cycles 8 kilometers in 30 minutes and the Harry's average speed obtained is 6 kilometers per hour.
Given:
Total distance covered by the Harry= 8 kilometers
Total time is taken by the Harry= 30 minutes
Convert total time to hours, the total time taken is obtained as:
Total time (hours) = 30 minutes / 60 minutes/hour = 0.5 hours
The average speed of the Harry is given by:
Average speed = Total distance / Total time
Average speed = 8 km / 0.5 hours
Average speed = 16 km/h
Therefore, Harry's average speed is 16 kilometers per hour when Harry cycles 8 kilometers in 30 minutes.
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While on her concert tour in the US, my Austrian friend Andrea brought along a small electric
fabric-steamer. The steamer draws a current of 4.2 A on a 220 V line in Austria. If she plugged it
into an electrical line in the US, where the household voltage is 110 V, how much current would
the steamer draw? How well do you think it will perform?
Answer:
A battery connected to a 140 resistor dissipates 17W of power. If the circuit contains only the battery and the resistor, what is the voltage of the battery?
Explanation:
Neutrons are found in what part of an atom ?
what is meant by cathode rays?
what is radio activity and state three of it's effects?
1cathode rays plural : the high-speed electrons emitted in a stream from the heated cathode of a vacuum tube
2: a stream of electrons emitted from the cathode of a vacuum tube —usually used in plural
Once you start pulling your object With less force than friction, what should you expect your object to do? What about when your object is pulled with more force than friction?
#Case -1
If Pulling force is less than frictional force the object won't move .
#Case-2
If Pulling force is greater than frictional force then object will be .
In order to calculate friction force you need Limiting friction first .
[tex]\\ \sf\longmapsto F_L=\mu sN[/tex]
u s is coefficient of static friction and N is normal reactionA 10-kg box is being pulled across the table to the right at a constant speed with a force of 50N, directed 30 degrees below the horizontal.
a.) Calculate the force of friction acting on the box.
b.) Calculate the normal force acting on the box.
Answer:
Explanation:
Assuming the table is horizontal
As speed is constant, friction must exactly balance the horizontal component of the applied force
Ff = 50cos30 = 43 N
The normal force must oppose both the weight of the box and the vertical component of the applied force.
N = 10(9.8) + 50sin30 = 123 N
The frictional force can be calculated with the angle and mass of the moving body and the normal force acting on it. The normal force on the body is 98 N and the frictional force is 7.712 N.
What is friction?Friction is the resistance to the movement of a body. If the motion is in a frictionless path then the body will moves in a constant speed in a straight line.
The normal force is the product of mass of the body and gravity 9.8. Then the frictional force can be calculated by the equation with of friction as follows:
Frictional force = F × cos ∅
is the angle.
Thus frictional force = 50N × cos 30
= 7.712 N
The normal force F = m × g
= 10 Kg × 9.8 m/s²
= 98 N.
Therefore, the normal force acting on the body moving with a constant speed and constant force 50 N and horizontal angle 30 degree is 98 N and the frictional force is 7.712 N.
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An airplane travels 2400 km at a speed of 600 km/h, decreases its speed to 400 km/h for the next 1200 km and travels the last 2,500 km at a speed of 500 km/h.
Problem 1, Question 1: What is the total travel time?
Total time:
Problem 1, Question 2: Find the average speed of the plane for the trip.
Average speed:
help :D
what happens to the cereal underneath the clear container when it's near a wool?
Answer:
they can't breath and they gon dead
Explanation:
yum yum yum yum yum
Answer:
the answer is in my mind but not coming in the mouth I'll tell you when I remember ''sorry ''
A diagram is drawn showing a swing set with a swing pulled backward prior to release. The diagram shows how the swing will move forward and then backward after it is initially released. At which point in the diagram is all of the energy gravitational potential energy?
A) as the released swing begins moving backward
B) at the highest point as the swing moves forward
C) when the swing is pulled back prior to release
D) just after release of the swing
Answer:C) When the swing is pulled back to prior release
Explanation:
This question involves the concepts of the law of conservation of energy, gravitational potential energy, and kinetic energy.
All of the energy is gravitational potential energy at "C) when the swing is pulled back prior to release".
The law of conservation of energy states that at any point the total energy of the swing must be constant, which means:
Total Energy = Gravitational Potential Energy + Kinetic Energy = Constant
It is clear that the swing has a non-zero speed in all given situations except the situation in part C), where the swing is at rest before release. Since the kinetic energy exists due to motion in the object. Hence, the kinetic energy will be zero when the swing is pulled back prior to release. It means all the energy in the swing at this time will be the gravitational potential energy.
Learn more about the law of conservation of energy here:
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The attached picture explains the law of conservation of energy.
At the instant shown in Figure 3, the blocks are moving toward each other with the same speed of 0.35 m/s. The blocks collide 0.50 seconds later. What is the speed of the two=block system's center of mass just before the blocks collide?
Answer:
The blocks c
Explanation:
When Beakman lets go of Liza and she starts moving her stored _____ changed into ____ energy.
A. moving / stopped
B. potential / kinetic
C. stopped / moving
D. kinetic / potential
A 200 kg object is pulled up an incline plane that has friction as the picture above shows. The object is pulled at a constant velocity. Calculate the tension on the rope.
A. 897 N
B. 936 N
C. 852 N
D. 978 N
Explanation:
the force to pull or push the block upwards (with the rope being parallel to the inclined plane) with 0 acceleration (moves with constant velocity) and therefore the tension on the rope is
Ft = m×g×sin(angle) + y×m×g×cos(angle)
force of gravity force of friction
down (down)
m = the mass of the object = 200kg
g = Earth's gravity acceleration = 9.8m/s²
y = the Greek letter mu, the coefficient of friction (it does not say "static" or "kinetic", I assume kinetic because the object is moving with a constant velocity, but it does not matter here) = 0.05
angle = 25 degrees
the result is N (Newton).
so, let's put the numbers into the equation and calculate :
200×9.8×sin(25) + 0.05×200×9.8×cos(25) =
≈ 828.33 N + 88.82 N ≈ 917.15 N
the closest answer option is B (936 N).
I don't know why there is this difference.
If a person has an acceleration of -1.5 m/s/s, then after 3.0 s thier velocity will have changed by m/s. If the initial velocity of the person was 2.0 m/s, then their new velocity is m/s. The initial velocity was in the direction and their final velocity was in the direction, so this person must have turned around during the 3.0 s. The average velocity of the person during the 3.0 s was m/s so their change in position during the 3.0 s must have been m. However, the distance the actual distance they covered was than their change in position because they changed direction.
If the person's initial position was 2.0 m, then their final position will be _____________ m.
Answer:
-1.5 m/s/s + (3.0 s + 2.0 m/s) = -7.5 m/s/s
-7.5 m/s/s x 3.0 s × 3.0 s × 3.0 s = - 202.5
Two balls were dropped at the same time from the top of a ladder. The balls are of equal size but ball A has more mass than Ball B. Which best describes the time it would take for the two balls to hit the ground
A .Not enough information
B. Ball B would hit the ground first
C. Ball A and B will hit the ground at the same time.
Answer:
A
Explanation:
If we ignore air resistance or friction, the balls would hit the ground at the same time. The question does not state whether or not there is air resistance.
If there was air resistance, ball A would hit the ground first.
Again, there is no information provided on whether is is air resistance or not, so there is not enough information.
Which of the following correctly identifies the relationship between the immune system and the integumentary system (skin, hair, & nails)?
A
The body releases solid, liquid, and gas pathogens
B
Mucus in the mouth, nose, trachea, and lungs captures pathogens
C
Bones create white blood cells
D
Hydrochloric acid in the stomach dissolves pathogens that are ingested
E
Blood carries white blood cells around the arteries, veins, and capillaries
F
The skin is the body's first physical barrier, hairs in the nose filter air as it enters the body, pores in the skin release toxins and pathogens
Answer:
F - The skin is the body's first physical barrier, hairs in the nose filter air as it enters the body, pores in the skin release toxins and pathogens
Describe a real life situation in which you have experienced Newtons First Law. Use the words “unbalanced force” and “inertia” in your answer
Plz help
Answer: Options that describes first law of motion from the question are;
An overall net force must be applied to an object before it can move.
Newton’s first law of motion is also known as the law of inertia.
Newton’s first law applies to an object whether it is moving or not.
Newton's first law states can be regarded as law of inertia. it made us to understand that when a body is resting then it keeps the rest unless there is external force been acted on it or if the body is moving at a constant speed, it will continue until there is external force acted.
A body will move from its resting only when net force is applied.
Example of this law is seen in when someone is sitting in a car putting on the seat belt.
This law applies to moving object as well as static object.
Therefore, option B,C and E right.
Explanation:
Answer: I would say like if a person jumps out of a moving vehicle, he falls forward due to inertia of motion. One example of Newton's first law in real life is, when you are walking with a glass filled with water, you will notice that the water spills at certain locations when you walk at faster pace.
Explanation:
2
Ca
+
O
2
→
2
CaO
What is the product of the reaction
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The product in a chemical reaction is written on the Right side of the arrow, so
the product formed here in given reaction is :
CaO (Calcium Oxide)is the answer 1.05m?? help me please. i just want to confrim my answer :3
Help!!!!!!!!!!!!!!!!
Answer:
_Sorrrrry_ I can't help u_
4word puzzle about sounds waves down
A car moving at 8.5 m/s crashes into a tree and stops in 0.32 s. Calculate the magnitude of the force, in newtons, the seatbelts exerts on a passenger in the car to bring him to a halt. The mass of the passenger is 66.5kg.
Answer:
Explanation:
I=Q2- Q1
And I = F. (t2-t1)
t = 0,32s
v = 8,5 m/s
Q = m.v
Q=66,5.8,5 = 565,25 kg.m/s
F. (t2-t1) = 565,25
F.0,32 = 565,25
F = 1766,4 N
You have discovered a planet that is one-quarter the radius of Earth (Rp = 1/4R⊕) and one-half as massive (Mp = 1/2M⊕). How does the gravity on the surface of this planet compare to the gravity on the surface of Earth (Fgp = XFg⊕)?
The new planet has the radius of only 1/4th of earth and mass of half that of earth. Then , the gravity on the surface of the new planet will be8 times higher than that of earth.
What is gravitational force?The gravitational force is the force by which an object attracts other object into its center of mass. Earth attracts every objects on ots surface to the ground by gravitation.
The force of gravitation is directly proportional to the mass and inversely proportional to the distance or radius of the planet.
g = G m/r²
Where G is the universal gravitational constant.
The new planet has the mass half of that of earth (me) and radius 1/4th of earth.
gn = G me/2 (re/4)²
= G 16 me/2
= 8 ge
Where ge is the gravity by earth and gn that of new planet. The gravitational force of the new planet will be 8 times greater than that of earth.
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The distance between tow objects is increased by 3 times the original distance. How will this change the force of attraction between the two objects?
Answer:
force of attraction will be increased by 9
Explanation:
force of attraction is inversely proportional to square of distance
i.e F= 1/R²
F=1/3R²
F=1/9R
multiply both side by 99×F= 9×1/9R
9F= 1/R
so force of attraction is 9 times
Một ô tô khối lượng một tấn chuyển động nhanh dần đều trên một đường bằng, hệ số ma sát giữa bánh xe và mặt đường là 0,1. Lực kéo của động cơ ô tô bằng 1200 N. Lấy g = 10 m/s2. Thời gian cần thiết để ô tô đạt được tốc độ 36 km/h từ trạng thái nghỉ là bao nhiêu?
The stability of a nucleus is based not on the binding energy but on the binding energy per ____________.
A. Neutrino
B. Proton
C. Electron
D. Nucleon
Một lò xo nhẹ, treo thẳng đứng có độ cứng k = 100 N/m. Vật nhỏ khối lượng m = 500 g được treo vào đầu dưới của lò xo, dao động điều hòa quanh vị trí cân bằng O. Tính lực đàn hồi của lò xo khi vật trên vị trí cân bằng 9 cm, lấy g = 10 m/s2 .
Answer:20
Explanation:
a student whose mass is 60kg runs up a height of 7.2m in 10.4 seconds find the power used by the student. (g=g.8m/s)
Answer:
p = w/t = mgh/t = 60kg*7.2m*10.4sec/10.4 = 432 watt
A device that absorbs and draws heat from a hot object, dispersing it into the
surroundings, is which one of the following?
A. Heat sink
B. Piston
C. Heat engine
D. Internal combustion engine
Answer:
A. Heat sink
Explanation:
Explain the
difference between an
oxygen atom and a carbon atom
Answer:
Carbon atoms are made up of 6 protons, 6 electrons, and 6 neutrons, whereas Oxygen atoms are made of 8 protons, 8 neutrons, and 8 electrons.
Explanation:
This may not sound like a big difference at the atomic level, but it is responsible for all of the differences between Oxygen and Carbon.
A 10 kg box initially at rest accelerates uniformly to a speed of 20 m/s in 2 seconds. Determine the A. energy gained by the block, B. Power developed by the box at the end of 10 seconds.
Answer:
20 40
Explanation:
A 10 kg box initially at rest accelerates uniformly to a speed of 20 m/s in 2 seconds, energy gained by the block 2000 J and Power developed by the box at the end of 10 seconds 5000 Watt
What is work done?The total amount of energy transferred when a force is applied to move an object through some distance
The work done is the multiplication of applied force with displacement.
Work Done = Force * Displacement
As given in the problem A 10 kg box initially at rest accelerates uniformly to a speed of 20 m/s in 2 seconds
By using the first equation of motion
v = u + at
20 = 0 + 2a
a = 10 m/s²
By using the third equation of motion
v² - u² = 2as
20² - 0² = 2×10×s
s = 400/20
s = 20 m
Force = ma
= 10 ×10
= 100 N
work done = Force × displacement
= 100 ×20
= 2000 J
Velocity after 10 seconds
V= u + at
= 0 + 10×10
= 100 m/s
work done after 10 seconds
= 1/2mv²
= 0.5×10×10²
=50000 J
Power = work done / time
= 50000/10
= 5000 Watt
Thus, energy gained by the block 2000 J and Power developed by the box at the end of 10 seconds 5000 Watt
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If a person paddles a canoe up a creek, a distance of 13.09 km, how fast does she need to move in order to get to the end of the creek within 2.371 hours?
Answer:
Below
Explanation:
To find the velocity of the person you can use this formula
velocity = displacement / time
velocity = 13.09 km / 2.371 hours
velocity = 5.5208 km/h
= 5.521 km/h
Hope this helps!