Answer:
The distance by which the child is safe is [tex]k = 10 \ m[/tex]
Explanation:
From the question we are told that
The speed of the motorcycle is [tex]v_n = 30 m/s[/tex]
The distance of the child from the motorcycle is L = 190 m
The reaction time is [tex]t_r = 1 \ s[/tex]
deceleration is [tex]a = -3m/s^2[/tex]
Generally the distance covered during the reaction time is
[tex]D = v_n * t_r[/tex]
=>[tex]D = 30 * 1[/tex]
=> [tex]D = 30 \ m[/tex]
Generally the distance covered during the deceleration
[tex]v^2 = u^2 + 2as[/tex]
Here v is the final velocity which is zero
So
[tex]0 = 30 ^2 + 2 * (-3)s[/tex]
=> [tex]s = 150 \ m[/tex]
So the total distance the motorcycle rider will cover before coming to rest is
[tex]d = D + s[/tex]
=> [tex]d = 30 + 150[/tex]
=> [tex]d = 180 \ m[/tex]
Therefore the amount of distance by which the child id safe is
[tex]k = L -d[/tex]
=> [tex]k = 190 -180[/tex]
=> [tex]k = 10 \ m[/tex]
If your mass is 45 kilometers and you travel to Jupiter where the acceleration due to gravity is 25.95 m/s², how much would you weigh on Jupiter?
A. 441.05 N
B. 450.172 N
C. 1,167.75 N
D. 2,595.0 N
Answer: A or B?
Explanation: its either those 2
a. Describe something that you do on a regular basis where friction slows you down (Use a different example than the ones in the lesson).
b. Describe two examples (different from the ones in the lesson) in which you have noticed friction creating thermal energy.
c. Describe two examples of activities that you do where you depend on friction, and would not be able to do them without friction. Please use different examples than the lesson.
Answer:
a. -For example, when you go to the supermarket with your parents and they let you drive the cart. You step on the back and push off which lets you get far in the isle, but in a bit you start slowing down
and eventually stop at all.
b. -First, when a car is driving the wheels meet friction all the time, as that happens the wheels get a bit hot.
-Second, when you are cold you rub your hands together fast until they are warm.
c.-First, you wouldn't be able to land an airplane correctly and it would be very, very hard to stop it from moving, as well as the car .
-We wouldn't be able to ice skate, we wouldn’t be able to slow down and turn normally.
Explanation:
(a) Friction is the force that opposes the rubber tyre from sliding on the road surface. This friction avoids skidding of vehicles. Applications of breaks in the vehicle to stop it- Friction braking is the most widely used braking method in vehicles.
(b) When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into thermal energy (that is, it converts work to heat). This property can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire.
(c)
Walking. Without friction between the shoes and the ground, you cannot walk properly. Driving. Writing. Rubbing of Hands for Warmth.Skating.Lighting Matchsticks.What is friction ?"Force that resists the sliding or rolling of one solid object over another." Frictional forces, such as the traction needed to walk without slipping, may be beneficial, but they also present a great measure of opposition to motion.
What is kinetic energy ?"Kinetic energy is a form of energy that an object or a particle has by reason of its motion." If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
What is thermal energy ?"Thermal energy refers to the energy contained within a system that is responsible for its temperature." Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process.
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Use the above formula to calculte work done.
Calculate the amount of work done by the force in moving the object through a distance of 9 m if an object is horizontally dragged
across the surface by a 130 N force acting parallel to the surface.
A-1170J
B-14J
C-507J
D-.070J
w=f.d
w=130.9
w=1170(a)
Answer:
A-1170
Explanation:
9x130=1170
dxf=w
When hitting this golf ball, this golfer generates a velocity of 29 m/s with the club head. If the mass of the club head is 0.22
kg, what is the Kinetic energy this golfer generates?
A. 92.5 J
B. 105.7 J
C. 96.1 J
D. 84.1 J
Answer:
c.97.1j
Explanation:
yan po ang answer
POSSIBLE POINTS:
Which distance can be most accurately measured with a meter stick?
The length of a river
The width of a book
The distance between two cities
The size of an object under a microscope
Answer:
Width of a book
Explanation:
A river is much wider than a meter (3’3”)
Width of a book will be a few inches to no more than a couple feet.
The distance between cities is hundreds and hundreds of meters.
A microscope is less than a couple inches.
energy loss happen when a filament bulb glow. Write a situation where this energy is used properly.
The use of energy for the purpose to boil water and warming the environment are the proper use of this lost energy.
How energy is properly utilized?The energy which is lost from the bulb is in the form of thermal energy. This thermal energy can be used to boil water or heating the surrounding environment so in this way the lost energy can be used properly.
So we can conclude that use of energy for the purpose to boil water and warming the environment are the proper use of this lost energy.
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Which change will cause the gravitational force between a baseball and a soccer ball to increase? Select three options. Moving the balls closer together moving the balls farther apart wrapping the soccer ball in layers of duct tape using a baseball with a thinner leather removing the outer layer of the baseball putting the baseball in a plastic case.
The three options are 1,3 and 5 Moving the balls closer together. The distance decreases and forces increase.
What is the gravitational force?The gravitational force ia s type of force has the ability attracts any two objects with mass. Gravitational force tries to pull two masses towards each other.
The value of the gravitational force is given by;
[tex]F_g=\frac{ Gm_ 1m_2}{r^2}[/tex]
It is observed that the gravitational force is directly propotional to the product of mass and inversly propotional to the square of the distance between them.
So, the correct options are :
(1) Moving the balls closer together. The distance decreases and forces increase.
(3) Wrapping the soccer ball in layers of duct tape will also increase force because the mass will increase.
(5) Similarly, putting the baseball in a plastic case will increase mass, and hence force increases.
Hence the three options are 1,3 and 5.
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When light goes straight through a medium that means it has been
Question 8 options:
absorbed
reflected
transmitted
Answer:
Reflected
Explanation:
During the process of reflection whatever that is sent forth e.g light comes back (reflects)
Answer:
transmitted
Explanation:
took quiz
Good evening! Can someone please answer this, ill give you brainliest and your earning 50 points. Would be very appreciated.
CAN SOMEONE PLEASE ACTUALLY ANSWER THIS, PEOPLE JUST PUT RANDOM ANSWERS UNDER THE QUESTION I KEEP ASKING...
Answer:
gases that are not good at absorbing long wave photons of infra red.
Explanation:
border green house gases are hydrogen chloride and carbon monoxide.Border line gases like CO are weak gases but has indirect effects on global warming. This causes warming in the atmosphere.CO has a heavy mass and thus lies on border line ozone layer. These are bad absorbers unlike CO2 and steam which absorb long waves of photon of infra red well.Option B is correct
What color will a green and red-striped shirt appear to be when only green light shines on it?
Answer:
Yellow
Explanation:
So while red, green and blue light shine upon the shirt, only red and green light will reflect from it. Red and green light striking your eye always gives the appearance of yellow; for this reason, the shirt will appear yellow.
chemical formula Periodic acid
the chemical formula for periodic acid is HI04
I hope this helps you
:)
Please help! Sorry if its blurry
create PHet waves and explain the different when it increase and decrease
A 3,000 kg car rests on rough horizontal ground. A rope is attached to the car and is pulled with a force of 11,000N to the left. As a result, the car accelerates at 3m/s2. The coefficient of sliding friction between the car and the ground is _____ (round to the nearest hundredth)
Answer:.07
Explanation hop this helps
Answer:.07
Explanation:
car that is moving with a speed of 36 m/s brakes to a stop in 12 seconds. Calculate the acceleration of
the car during the braking
Answer:
how?
Explanation:
A boy runs 125 meters north, and the. 75 meters south
Answer:
50 meters
Explanation:
50 meters
50 meters
Describe and explain the action of optical fibres
particularly in medicine and communications
technology
Answer:
Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data rates) than wire cables.
Explanation:
A net force of 10. newtons acts on an object of mass 6.0 kilograms for 8.0 seconds. What is the magnitude of the change in the object's momentum?
A. 48 N-s
B. 60. N-s
C. 80. N-s
D. 480 N-s
Answer: A, B, C
Explanation: its either those:)
The magnitude of the change in the object's momentum will be equal to 80 N-s. Hence, option C is correct.
What is momentum?The momentum is the result of a particle's velocity and its mass. Force and motion, meaning it has both magnitude and the direction. According to Isaac Newton's second equation of motion, the force acting on a particle equals the time rate of increase of momentum.
The impulse, which is the product of the force and the intervals (the impulse), is equal to the difference in momentum, according to Newton's 2nd law, if a steady force operates on a particle for a specific amount of time. On the other hand, a particle's momentum is the amount of time needed for a consistent action to fight it to rest.
As per the given information in the question,
The initial momentum of the system is 0.
F = ma
a = F/m
a = 10/6
a = 1.67 m/s²
Use the equation of motion,
v = u + at
v = u + (1.67)(8)
v = 13.33 m
Then the momentum will be,
p = mv
p = 6 × 13.33
p = 80 N-s.
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is density the degree of compactness of a substance?
Which object is accelerating downward at the slowest rate? a textbook falling onto the surface of the moon a flower pot that has been pushed out a window a pebble falling off a cliff through the air a baseball thrown from third base to first base
Answer:
The acceleration of textbook is downward at the slowest rate.
(a) is correct option.
Explanation:
Given that,
The object is accelerating downward at the slowest rate.
(a). a textbook falling onto the surface of the moon
(b). a flower pot that has been pushed out a window
(c). a pebble falling off a cliff through the air
(d). a baseball thrown from third base to first base
We know that,
Acceleration :
Acceleration is the product of mass of object and gravity.
[tex]a=mg[/tex]
We need to find the accelerating downward at the slowest rate
According to given data,
Acceleration depends upon weight and gravity.
We have some example of free fall.
(b), (c) and (d) are the example of free fall.
In which the gravity is same.
But in option (a) textbook falling onto the surface of the moon
We know that,
The gravity on the moon is less than the earth.
So, we can say that the acceleration of textbook is downward at the slowest rate.
Hence, The acceleration of textbook is downward at the slowest rate.
(a) is correct option.
A plane is traveling in northeast direction with a velocity of 75 m/s. The velocity vector of the plane makes a 40° with east-west line.
Answer:
Summary of Photorealism
The name Photorealism (also known as Hyperrealism or Superrealism) was coined in reference to those artists whose work depended heavily on photographs, which they often projected onto canvas allowing images to be replicated with precision and accuracy. The exactness was often aided further by the use of an airbrush, which was originally designed to retouch photographs. The movement came about within the same period and context as Conceptual art, Pop art, and Minimalism and expressed a strong interest in realism in art, over that of idealism and abstraction. Among several male practitioners of Photorealism there is an interest in themes of machinery and objects of industry such as trucks, motorcycles, cars, and even gumball machines, whereas Audrey Flack, the sole female practitioner, infuses her works with greater emotionality and the transience of life. Ultimately, the Photorealists were successful in attracting a wide audience, but they are often overlooked by art historians as an important avant-garde style.
Key Ideas & Accomplishments
Explanation:
The area around the magnet where the force of the magnet attracts objects with metal is known as what?.
3.Calculate the acceleration of a 1kg toy airplane that has been thrown with a force of 20N.
Answer:
The acceleration of a 1kg toy is 20m/s^2Explanation:
We are going to use the newtons law of motion (first law) to solve this problem
The expression is F=mawhere F is the force in Newton
m is the mass in kg and
a is the acceleration in m/s^2
given data
mass of the toy m= 1kg
force with which the toy is thrown = 20N
susbtituting we have
20=1*a
a= 20m/s^2
During the combination of copper sulfate solution and zinc metal, 5 atoms of sulfate and 1 atom of copper interact with 1 atom of zinc, resulting in new products after the reaction. How many atoms are there before and after the reaction? Choose the letter of the correct answer.
A
before: 7 atoms; after: 5 atoms
B
before: 7 atoms; after: 6 atoms
C
before: 7 atoms; after: 0 atoms
D
before: 7 atoms; after: 7 atoms
Make a sketch of the human nerve cell. What function do nerve cells perform
Answer:
The function of a nerve cell, also called a nueron, is to transmit messages from the body to the brain and from the brain to the body.
a horse mass of 150kg it has force of 50n what is its acceleration
Remember, there's 2 types of accelaration formula.
1st formula :
a = ( final speed - initial speed ) ÷ time
2nd formula :
resultant force (f) = mass × a
or
a = resultant force (f) ÷ mass
So the ans shld be,
a = 50 x 150
= 7500 m/s²
The acceleration of the body is 0.33 m/s².
What is meant by acceleration of an object ?Acceleration of an object having mass is defined as the net force acting on the object per unit mass.
Here,
Mass of the body, m = 150 kg
Force acting on the body, F = 50 N
The net force acting on an object is defined as the product of mass and acceleration of the object.
The expression for the net force acting on the body is given by,
F = ma
Therefore, the acceleration of the body,
a = F/m
Applying the values of F and m,
a = 50/150
a = 0.33 m/s²
Hence,
The acceleration of the body is 0.33 m/s².
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PLEASE HELP: A car is traveling at 72.0 km/h, when the driver notices an overturned truck blocking the road 95.0 m ahead. The car travels at 72.0 km/h for 0.50 s before the driver applies the brakes. (Please show work).
(a) How far does the car travel in that 0.50 s?
(b) If the car has an acceleration of -2.50 m/s², will it be able to stop before reaching the truck? If not, how fast is the car traveling when it collides with the truck?
Answer:
10 m
Yes, the car will be able to stop before it reaches the truck.
Explanation:
[tex]u=\text{Initial velocity of the car}=\dfrac{72}{3.6}=20\ \text{m/s}[/tex]
[tex]t=\text{Time}=0.5\ \text{s}[/tex]
[tex]s=\text{Displacement}[/tex]
From the laws of motion we have
[tex]s=ut+\dfrac{1}{2}at^2\\\Rightarrow s=20\times 0.5+0\\\Rightarrow s=10\ \text{m}[/tex]
The car will travel 10 m in 0.5 seconds
[tex]a=\text{Acceleration}=-2.5\ \text{m/s}^2[/tex]
[tex]v^2-u^2=2as\\\Rightarrow s=\dfrac{v^2-u^2}{2a}\\\Rightarrow s=\dfrac{0^2-20^2}{2\times -2.5}\\\Rightarrow s=80\ \text{m}[/tex]
Total distance required for the car to stop is 10+80 = 90 m. So, the car will be able to stop before it reaches the truck.
What is the voltage of a computer if the current if 40A and the resistance is 20 ohms?
Voltage = current x resistance
Voltage = 40 x 20 = 800 volts
Answer:
800v
Explanation:
v=IR
where V =Voltage,
I= Current
R= Resistance
V= 40x20
800v
When should scientific claims be questioned?
a. If you don't agree with them
b. If they are hard to understand
C. If they are based on a very small sample
d. If they are new
PER
Please select the best answer from the choices provided
Answer:
C) if they are based on a very small sample
The titanium shell of an SR-71 airplane would expand when flying at a speed exceeding 3 times the speed of sound. If the skin of the plane is 400 degrees C and the linear coefficient of expansion for titanium is 5x10 -6 /C when flying at 3 times the speed of sound, how much would a 10-meter long (originally at 0C) rod portion (1-dimension) of the airplane expand?
Answer:
The 10-meter long rod of an SR-71 airplane expands 0.02 meters (2 centimeters) when plane flies at 3 times the speed of sound.
Explanation:
From Physics we get that expansion of the rod portion is found by this formula:
[tex]\Delta l = \alpha\cdot l_{o}\cdot (T_{f}-T_{o})[/tex] (Eq. 1)
Where:
[tex]\Delta l[/tex] - Expansion of the rod portion, measured in meters.
[tex]\alpha[/tex] - Linear coefficient of expansion for titanium, measured in [tex]\frac{1}{^{\circ}C}[/tex].
[tex]l_{o}[/tex] - Initial length of the rod portion, measured in meters.
[tex]T_{o}[/tex] - Initial temperature of the rod portion, measured in Celsius.
[tex]T_{f}[/tex] - Final temperature of the rod portion, measured in Celsius.
If we know that [tex]\alpha = 5\times 10^{-6}\,\frac{1}{^{\circ}C}[/tex], [tex]l_{o} = 10\,m[/tex], [tex]T_{o} = 0\,^{\circ}C[/tex] and [tex]T_{f} = 400\,^{\circ}C[/tex], the expansion experimented by the rod portion is:
[tex]\Delta l = \left(5\times 10^{-6}\,\frac{1}{^{\circ}C} \right)\cdot (10\,m)\cdot (400\,^{\circ}C-0\,^{\circ}C)[/tex]
[tex]\Delta l = 0.02\,m[/tex]
The 10-meter long rod of an SR-71 airplane expands 0.02 meters (2 centimeters) when plane flies at 3 times the speed of sound.