Kinetic Friction, or Sliding Friction, is the friction between skates and ice. When two items slide past each other, this form of friction develops.
Sliding Friction is created when the skate blade passes through the ice. The beautiful curves are governed by the second law. Acceleration is required for a change in velocity, which includes both speed and direction. Because of the constantly changing direction, traveling in a circle at a constant speed includes acceleration. Because everyone is initially at rest, the system's linear momentum is zero. Because there is no external force acting on the system when the guy throws the ball, linear momentum must be conserved.
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1. Rearrange the equation for the area of a rectangle (A = l w) to solve for length, l.
Step 1
Step 2
Step 3
Step 4
2. Rearrange the equation for velocity v = d/t to solve for time, t.
Step 1
Step 2
Step 3
Step 4
A baseball is thrown with a speed of 36 meters per second (m/s). What is the distance from the mound to home plate if the ball takes 0.5 seconds to leave the pitcher's hand and cross the plate? A-72 B-18 C-41 D-31 Help me out please
Answer:
d = 18 m
Explanation:
Given that,
The speed of a baseball, v = 36 m/s
We need to find the distance from the mound to home plate if the ball takes 0.5 seconds to leave the pitcher's hand and cross the plate.
Let the distance be d. We can find it using the formula,
Speed = distance/time
or
[tex]d=vt\\\\d=36\times 0.5\\\\d=18\ m[/tex]
So, the required distance is equal to 18 m.
Astronomers were at first surprised to find complicated molecules in the interstellar medium. They thought ultra-violet light from stars would break apart such molecules. What protects the molecules we observe from being broken apart?A. such molecules form in cells, and there is a protective membrane around each cellB. such molecules always form inside stars; the stars outer layers protect themC. such molecules form in clouds that contain significant amounts of dust, and the dust in the cloud protects them from ultra-violet raysD. such molecules form only in the regions that are already millions of degrees hot and thus can’t be affected by ultra-violet raysE. you can’t fool me; the seeming discovery of complex molecules out there was a mistake, and astronomers now realize there are no molecules out there.
Answer:
The objects that protects the molecules observed from being broken apart is option C;
Such molecules form in clouds that contain significant amount of dust, and the dust in the cloud protects them from ultra-violet rays
Explanation:
The existence of high energy cosmic and ultraviolet radiation is capable of breaking molecules present within translucent clouds in the interstellar medium.
However, when the light is passed through translucent clouds that are several light years thick or through non-transparent clouds interactions with the gases and dusts result in changes in the starlight that reaches a certain distance such as Earth
Therefore, the formation and presence of such molecules in clouds that are made up of dust serves to protect them from being broken by the high energy ultraviolet rays from the stars.
Which applications, either for diagnostic purposes or for therapeutic purposes, do not involve ionizing radiation? Check all that apply.
Answer: I do not know (is this an RP question? ;-;)
Explanation:
Answer:
Applications in which ionizing radiation are not used are
MRI
ultrasound
laser surgery
Explanation:
hope its right
bestfriend
Which of the following is the best example of motion?
A. Waving your arms
B. Tossing and turning in your bed
C. Walking from home to school
D. Your dog wagging his tail
Answer:
Maybe A. waving your arms?
how fossils influence and change our understanding of the history of Earth and it's species.
Answer:
Fossils are the preserved remains or traces of animals, plants, and other organisms from the past. Fossils are important evidence for evolution because they show that life on earth was once different from life found on earth today.
Explanation:
Your little cousin loves ice cream bars. You buy him one and he starts to lick it. As you sit down on a park bench, he drops
the bar on the seat of the bench. You pick up the bar to throw it away, but he starts to cry, so you shrug and give it back to
him. Will he definitely get sick?
Answer:
nop
Explanation:
It is not certain whether the child will get sick from eating the ice cream bar that was dropped on the bench.
What is contamination?Contamination refers to the presence or introduction of harmful substances or organisms into a material, environment, or food source.
There is a possibility that the ice cream bar could have picked up bacteria or other contaminants from the bench that could make the child sick. However, the risk of illness depends on a number of factors, including the cleanliness of the bench, the length of time the ice cream was in contact with the bench, and the overall health of the child's immune system.
To reduce the risk of illness, it is important to wash hands and surfaces frequently, especially when handling food. If possible, it is best to discard food that has come into contact with potentially contaminated surfaces to prevent the spread of illness. However, if the child has already eaten the ice cream bar and does become sick, it is important to monitor their symptoms and seek medical attention if necessary.
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Two students noted that the acceleration of a car was - 40 km/s^2. The first student said, “That can’t be right. You can’t have a negative acceleration.” The second student said, “That can’t be right. You can’t have s^2.” What would you say to each student to help them better understand how acceleration is described? pls answer
Plan an experiment to measure the ideal mechanical advantage of a three-hole punch. (a) What materials would you need? (b) What procedure would you use?
Answer:
A) Three hole punch and either a layered plastic or paper
B) Identify the lengths involved ,
Length of input arm / length of output arm = L1/ L2
Explanation:
a) Materials involved includes :
Three hole punch and either a layered plastic or paper
Identify the forces acting on the three-hole punch which are Input and output forces
Identify the points where they act
B) procedures involved
The mechanical advantage = output force / input force
step one: Identify the lengths involved
assuming no friction or relatively small friction \
mechanical advantage can be calculated as : Length of input arm / length of output arm = L1/ L2
How is the reflection of a light
ray from a plane mirror different from the
refraction of a light ray as it
enters a piece of glass?
Explanation:
Because during reflection of light rays from plane mirror only bouncing back of light rays takes place while as during refraction of light rays through a block of glass bending of light rays occurs.
The constant movement of rising warm air and sinking cool air in Earth's atmosphere is called atmospheric convection. What does atmospheric convection produce?
Answer:
sunspots
Explanation:
What can we say about the forces? A. They are balanced. B. They are unbalanced. C. They are not in equilibrium.
You can say anything you want to about them without fear of contradiction. There's no information here to prove you wrong.
If a body carries a charge of +3 C, then which of the following is true?
а) It has an excess of 4.8 x 10^19 electrons
b) It has an excess of 1.87 x 10^19 electrons *1019
C) It is deficit of 1.87 x 10^19 electrons
d) It is deficit of 4.8 x 10^19 electrons
Answer: C) it is deficit of 1.87 x 10^19 electrons
Explanation:
How much must you raise the
temperature of 1.00 m^3 of water
so that its volume expands by
0.00100 m^3?
Water
B = 207-10-6 0-1
(Unit = C)
Answer:
4.83 °C
Explanation:
001 = λ*ΔT
ΔT = 10^-3*10^6/207 = 4.83°C
Answer:
4.83
Explanation:
An object is located 20.0 cm from a convex lens. The lens focuses light at a
distance of 10.0 cm. What is the image distance?
A. 6.67 cm
B. -6.67 cm
C. -20.0 cm
D. 20.0 cm
The Answer Is : D. 20.0 cm
My Reason : These types of problems can all be solved using the lens or mirror equation.
1/20 +1/q= 1/10
q=20 cm
The image is formed behind the lens at 2f or the center of curvature.
It is real, inverted, and the same size as the object
The Answer Is: D. 20.0 cm
Explanation: I did the test :)
Robb wants to win the next sled race. He asks for your advice. What would you tell him he should change in order to win? Explain why your solution would work in terms of energy.
Answer: Start at the top of the hill.
Explanation:
The options include:
a. Start at the bottom of the hill.
b. Start at the top of the hill.
c. Start in the middle of the hill.
Sled racing is simply a winter dog sport racing. Since Robb wants to win the next sled race, the advice that'll be given to him is that he should start at the top of the hill.
Other options such as starting at the bottom of the hill or the middle of the hill are wrong.
which lens have plus power
Answer:
Explanation:
A plus lens which is convex in shape, converges light and the accommodative system must relax in order to keep an image clear.
A globe (model of the Earth) is a hollow sphere with a radius of 16 cm. By wrapping a cord around the equator of a globe and pulling on it, a person exerts a torque on the globe of 120 N • m for 1.2 s. What angular momentum does the globe have after 1.2 s?
Answer:
144 kg m^2/s
Explanation:
The equivalent resistance in a series circuit is found by ____
the resistances of all the resistors.
A. multiplying
B. comparing
C. adding the reciprocals of
D. adding
Explanation:
In a series circuit the equivalent resistance is the algebraic sum of the resistances.
What electromagnetic wave travels the fastest?
Answer:
C
Explanation:
Ultraviolet since it is a consumable of light
When you are sitting in a chair, your body exerts a _____
on the chair and the chair exerts the ____ force back.
it can either be:
force
friction
same
different
interacting objects
mass
or push
A 100 L ball is blown up inside at 200K. It is then taken outside in the hot sun, and the volume increases to 150 L. What is the new temperature?
Answer:
Temperature, T2 = 300 Kelvin
Explanation:
Given the following data;
Initial volume = 100 Liters
Initial temperature = 200 Kelvin
Final volume = 150 Liters
To find the final temperature T2, we would use Charles' law.
Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.
Mathematically, Charles is given by;
[tex] \frac {V}{T} = K[/tex]
[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]
Making T2 as the subject formula, we have;
[tex] T_{2}= \frac{V_{2}}{V_{1}} * T_{1}[/tex]
Substituting into the formula, we have;
[tex] T_{2}= \frac{150}{100} * 200[/tex]
[tex] T_{2}= 1.5 * 200 [/tex]
Temperature, T2 = 300 Kelvin
Decribe the general shape of the graph.
Answer:
the results increase, positive
A rock has a density of 2 g/mL and a mass of 17.5 g. What is the volume of the rock?
HELP PLEASE
Calculate the force of an object shot in the air with a mass of 2 kg and an acceleration of 9.81 m/s2.
Answer:
Force = 19.62 Newton
Explanation:
Given the following data;
Mass = 2kg
Acceleration = 9.81 m/s²
To find the force;
Newton's Second Law of Motion states that the acceleration of a physical object is directly proportional to the net force acting on the physical object and inversely proportional to its mass.
Mathematically, it is given by the formula;
Force = mass * acceleration
Substituting into the formula, we have;
Force = 2 * 9.81
Force = 19.62 Newton
GIVING BRAINLIEST PLEASE HELP!!
-if you answer correctly ill give you brainliest which will give you 23pts-
Answer:
B is the answer!!
Explanation:
A car and a semi-truck are both traveling along a road. Based on Newton's 2nd law, what will happen if both cars apply the same type of brakes at the same time?
Answer: ask god in your prayers
Explanation: im here for the same reason you are
I DONT KNOW THE ANSWER
Answer:
The semi-truck will stop after the car.
Explanation:
It will do that because the semi-truck has more mass than the car.
why don't planets crash into each other?
Answer:Planets can't be in just any orbit, they have to be far enough apart so that they don't hit each other, and aren't drawn into collision by gravity
Explanation:
A man is out roller skating and swerves to miss a crowd. If his curved path has a radius of 2.0 m and he experiences a centripetal force of 5.0 m/s2, what is his speed?
1.6 m/s
3.2 m/s
0.63 m/s
10. m/s
Answer:
0.63
Explanation:
because i used the sin symbol
A wave traveling at 200 m/sec has a wavelength of 2.5 meters. What is the frequency of this wave
Answer:
600Hz
Explanation: