Students place the end of a wooden board on some books so that the board can be used as an inclined plane. The
students release a ball at the top of the inclined plane and measure the time for the ball to reach the bottom of the
ramp. The students perform three trials. The students then cover the board with a cloth and follow the same
procedure as before. The data are graphed below.
Part A
Describe two forces acting on the ball during the investigation.
Part B
Explain why the ball takes more time to roll down the ramp with a cloth surface.
Part C
Explain why the students repeated the investigation three times.
Part D
Explain how the ball's energy changes as the ball moves down the ramp.
Friction is the force that opposes motion.
What is friction?The term friction refers to the force that hinders the movement of a surface over another. The frictional force depends on the nature of the surfaces in contact.
1) The two forces acting on the ball during the frictional force are the forward force and the frictional force.
2) The ball takes more time to roll down the incline in the presence of the cloth because of the increase in friction of the surface.
3) The students repeated the investigation there times in order to ensure accuracy of the results.
4) The energy of the ball changes from potential energy at the top of the ramp to kinetic energy as it rolls down the ramp.
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A very fast train starts running from the earth at a speed of 60 miles per hours . How many years will it take to reach Uranus without stopping anywhere?
Time:-
[tex]\\ \rm\hookrightarrow \dfrac{2.998\times 10^9}{96}[/tex]
[tex]\\ \rm\hookrightarrow 0.0312\times 10^9[/tex]
[tex]\\ \rm\hookrightarrow 3.12 \times 10^7hrs[/tex]
The person would have died before reaching Uranus .
Two wires made of the same Two wires made of the same material are
stretched by equal forces. The second wire
is twice as long as the first one and also has
twice the diameter of the first wire.
If the first wire is stretched by 7.7 cm, then
by how long is the second wire stretched?
The second wire is stretched by 15.4 cm long provided the two-wire are made of the same materials and equal forces.
What is the Young's Modulus of Elasticity?Young's Modulus of Elasticity explains the elastic characteristics of a solid experiencing tension or compression in a unilateral direction
Here, the material used is a wire which returns to its length after being stretched or compressed.
From the parameters given:
There are two wires with the same materials, stretched by equal forces.If the second wire is as twice as first, then:
2x = xwhere;
x = first wire = 7.7 cm2x = second wire = 7.7 cm × 2 = 15.4 cmLearn more about Young's Modulus of Elasticity here:
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PLEASE HELP! WILL GIVE BRAINLIEST! A jet travels through air at 464.1 m/s. If the air has a temperature of 0 degrees C, at what Mach number is the jet flying?
Answer:
Mach 1.4
Explanation:
V = 331.5 + 0.6*0 = 331.5 m/s
464.1/331.5 = Mach 1.4
Question 20 Essay Worth 5 points)
What is the power rating of an LED light bulb if 0.50 A flow through it when connected to an 18 V battery?
Remember to identify all data (givens and unknowns), list equations used, show all your work, and include units and the proper number of
significant digits to receive full credit
So, the power rating of that LED light bulb is 9 Watt.
IntroductionHi ! I will answer your question. This material is about electricity where You are instructed to calculate the rated power of a lamp. Always remember, the power required by the lamp must also be at least the same as the power from the mains so that the light is not too dim or the lamp does not explode.
Formulas UsedIn this question, the formula used is the formula for calculating power, which is the product of the voltage and current flowing. It can be seen mathematically as below:
[tex] \boxed{\sf{\bold{P = V \times I}}} [/tex] Or
[tex] \boxed{\sf{\bold{P = \frac{V^2}{R}}}} [/tex]
With the following condition :
P = power that needed (Watt or W)V = voltage that used (Volt or V)I = current that flowed (Ampere or A)R = resistance in electric tools (Ohm or [tex] \sf{\varOmega} [/tex])Problem SolvingWe know that :
V = voltage that used = 18 VI = current that flowed = 0.50 AWhat was asked :
P = power that needed = ... WStep by step :
[tex] \sf{P = V \times I} [/tex]
[tex] \sf{P = 18 \times 0.5} [/tex]
[tex] \boxed{\sf{P = 9 \: Watt}} [/tex]
Conclusion :So, the power rating of that LED light bulb is 9 Watt.
PLEASE HELP! Will give BRAINILIEST! An amplifier can magnify the intensity of sound waves by a factor of 1,000. If a 30dB sound is fed into the amplifier, how many decibels will come out?
Answer:
30,000dB
Explanation:
30,000dB because 30 multiplied by a factor of 1000 is 30,000
Hope this helps! :)
5. Suppose a space ship traveling at 1000 miles per hour enters an area free of gravitational forces and
free of air resistance. If the pilot wishes to slow the ship down, he can accomplish that by shutting off
the engine for a while.
a. True
b. False
Answer:
False
Explanation:
Unless it encounters external factors, the ship will continue to move at a fixed pace even if the engine is turned off.
17. Which one of the following temperatures is equal to 5°C?
OA. 278K
ОВ.0К
OC. 418
0D.465K
Answer:
A. 278K
Explanation:
I look it up it and I used a conversion chart
The cheetah is considered the fastest running animal in the world. Cheetahs can accelerate to a speed of 21.5 m/s in 2.50 s and can continue to accelerate to reach a top speed of 28.5 m/s. Assume the acceleration is constant until the top speed is reached and is zero thereafter.
Express the cheetah's top speed in mi/h.
Answer: 63.753 mph
Explanation:
[tex]28.5 \frac{m}{s} * \frac{1 mile}{1609.34 m} * \frac{3600s}{1 hour} = 63.753 \frac{miles}{hour}[/tex]
What is the most important reason that astronomers have learned more about our planetary system in the last 30-40 years than all of history before then.
Earth exerts a 100 N gravitational force on a metal box. What is the magnitude of the gravitational force the metal box exerts on Earth? Explain your answer
We have that the magnitude of the gravitational force is mathematically given as
f=6.377N
ForceQuestion Parameters:
Earth exerts a 100 N gravitational force on a metal box.
(Mass of the earth is 6e24 kg and radius of the earth is 6.4e6m.)
Generally the equation for the Gravitational mForce is mathematically given as
[tex]F=\frac{GMm}{r^2}\\\\Therefore\\\\F=\frac{100/9.8* 6e116e24}{6.4e6^2}[/tex]
f=6.377N
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a propeller has a diameter of 76 inches. what is the area covered by the propeller after 3 complete turns?
Answer:
looking at aircraft of a similar size and performance, the propeller diameter is generally in the region of 1.4 – 1.8 m (4.6 ft to 6.0 ft).
Explanation:
A variable resistor is set to a value of 5 ohms, and a current-voltage (I-V) graph (with I on the y-axis and V on the x-axis) is plotted for it. Its resistance is then doubled to 10 ohms. What effect will this have on its I-V graph?
When the resistance is doubled, the current reduces by half.
Ohms lawOhms law states that the voltage applied to a circuit is directly proportional to the current flowing in the circuit.
V = IR
V/R = I
where;
V is emf of the batteryR is resistanceI is the currentFrom the equation above, when the resistance is doubled, the current reduces by half.
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Which object would have the highest gravitational attraction?
A. compact car
B. bicycle
C. semi truck
As a spaceship travels from Earth to the moon, which value never changes?
A. velocity
B. weight
C. acceleration
D. mass
Answer:
1. C semi truck
2. C acceleration
Explanation:
If you wanted to move an electron from the positive to the negative terminal of the battery, how much work WWW would you need to do on the electron
The work is simply W = V Q where V is the voltage of the battery and Q the charge on the electron
W = V joules/coulomb * E coulombs = joules
11
A bus travels at 54.0 km h while moving but after accounting for stopping time, to let
passengers on and off the coach, it averages a speed of 45.0 km h. How many minutes does
the bus stop for each hour?
Answer:
10 minutes
Explanation:
Given:
Given:Speed of bus excluding stoppages =54 km/h
Speed of bus including stoppages = 45 km/h
To calculate: Minutes/per hour the bus stopped = ?
Distance covered by bus without stopping =54 km/h
Distance covered by bus with stopping =45 km/h
Due to stoppages it could
9km (54-45km) less
Time taken to cover 9 km=?
time \: taken \: = \frac{distane}{speed }timetaken=
speed
distane
Distance=9km
Speed = 54km/h.
Substituting given values on the above formula we get,
time \: taken \: = \frac{9}{54} hour = \frac{1}{6} hour \:timetaken=
54
9
hour=
6
1
hour
=10 minutes
Hence,the correct answer is 10 minutes.
Describe how acceleration and velocity are related and specify if these are scalar or vector quantities.
A car starts from rest and speeds up to 30 m/s in a total of 6 s.
What is the acceleration?
ctive
5 m/s2
30 m/s
ker
24 m/s2
5 m/s
Answer:
5 m/s2
Explanation:
Using the equation velocity = initial velocity + (acceleration x time)
30 m/s = 0 + acceleration x 6 s
30 m/s = 6 s x acceleration
30 m/s / 6s = acceleration
acceleration = 5 m/s2
How many valence electrons does each atom have in the Bohr diagrams?
The number of valance electrons in the given Bohr Diagram is 7 electrons each.
What is Bohr diagram?Bohr diagrams depict electrons orbiting the nucleus of an atom in the same way that planets orbit the sun.
Electrons in the Bohr model are depicted as traveling in circles at different shells depending on the element.
We now know that the Bohr Model has some flaws, but it is still widely used because of its straightforward approach to atomic theory.
The Bohr model was also the first to incorporate quantum theory into an atomic model, making it the forerunner of today's more accurate quantum-mechanical models.
Each valance electron in the given Bohr Diagram has 7 electrons.
Thus, the valance electrons in each of the given diagram is 7 electrons as they have these electrons in their outermost shell.
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. If the electrical force of repulsion between two same amount of charges is 10 N, and
they are 30000 m apart. What is the magnitude of each charge?
Answer:I dont know
Explanation:
Because I dont know
You are using a wrench to loosen a bolt. The wrench has a 0.330 m long handle and you apply 205 Newtons of force perpendicular to the end of the handle. How much torque have you applied?
Answer: Try and subtract
Explanation:
Rahim and john were two friends. once rahim went to visit the new house of john . to expel hot air out of the kitchen, john fitted an exhaust fan on his kitchen window. by seeing this , rahim said to john that an exhaust fan should place on the wall near his kitchen ceiling. otherwise, the exhaust fan will not expel the hot air more effectively.
(a). is rahim right or wrong ? why?
(b). how a vantilator works in circulating fresh air in the room?
Answer soon as possible
Answer:
i don't know how to explain it but I think it's just the way you do it by yourself
You are riding your bike at 5 mis. In order to avoid hitting a child that has
run into the street, you slam on your brakes and slow to a stop. It takes you
1.5 seconds to fully stop. What was your acceleration?
You are riding your bike at 5 m/s. In order to avoid hitting a child that has run into the street, you slam on your brakes and slow to a stop. It takes you 1.5 seconds to fully stop. Acceleration will be 3.33 [tex]m/s^{2}[/tex]
The branch of physics that defines motion with respect to space and time, ignoring the cause of that motion, is known as kinematics. Kinematics equations are a set of equations that can derive an unknown aspect of a body’s motion if the other aspects are provided.
given
speed = 5 m/s
time = 1.5 seconds
using
v = u + at
0 = 5 + a ( 1.5 )
a = -5 / 1.5
= 3.33 [tex]m/s^{2}[/tex]
Acceleration will be 3.33 [tex]m/s^{2}[/tex]
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A transverse wave traveling along a string transports energy at a rate r. If we want to double this rate, we could: _____________
a. increase the amplitude of the wave by a factor of 8.
b. increase the amplitude of the wave by a factor of 4.
c. increase the amplitude of the wave by a factor of 2.
We will increase the amplitude of the wave by a factor of 4 If we want to double this rate
Transverse wave energy travelTransverse wave, travels in a way in which points on a wave oscillate along paths at right angles of 90 degrees to the direction of the wave.
We see that energy transported along a wave path is directly proportional to the square of the amplitude.
E =kA^2
Therefore, we will increase the amplitude of the wave by a factor of 4 If we want to double this rate.
Option B
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A car starts from rest and accelerate at 9 m/s?. At the end of 240 m long drive, what is its speed.
A car starts from rest and accelerates at 9 m/s². After 240 m. the final speed is 66 m/s.
What is Uniformly Accelerated Motion?Uniformly Accelerated Motion is the motion of an object where the acceleration is constant.
A car starts from rest, that is, its initial speed is 0 m/s. It accelerates at 9 m/s². We can find the final speed after 240 m using the following kinematic equation.
v² = u² + 2 × a × s
v² = (0 m/s)² + 2 × (9 m/s²) × 240 m
v = 66 m/s
where,
v is the final speed.u is the initial speed.a is the acceleration.s is the displacement.A car starts from rest and accelerates at 9 m/s². After 240 m. the final speed is 66 m/s.
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Spring tides occur when solar and lunar tides are in sync with each other. On the diagram, identify the two moon phases that correspond to a spring tide.
Answer
Sun and Moon's gravity
hii guyss how r u all many days after i came online!!
Answer:
I AM COOL DUDE HOW R U?
Explanation:
An ant climbs at a steady speed up the side of its
anthill, which is inclined 30.0" from the vertical. Sketch
a free-body diagram for the ant.
Pleas help me it urgent !?
The weight of the ant is the force that acts on the anthill in the downward direction and at angle of 30° rom the vertical.
Given the following data:
Angle of inclination = 30.0°.What is a free-body diagram?In Science, a free-body diagram can be defined as a graphical illustration which is typically used to visualize moments, tension, and applied forces that are acting on an isolated or rigid body (object) while using arrows pointing in the direction of these forces.
In this scenario, the weight of the ant is the force that acts on the anthill in the downward direction and at angle of 30° rom the vertical.
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mary jogs for 15 min at 240 m/min, walks the next 10 min at 90 m/min
Answer: 4500 m
Explanation:
[tex]15 min. * \frac{240 m}{min.} = 3600 m[/tex]
[tex]10 min. * \frac{90m }{min.} = 900 m[/tex]
[tex]3600m +900m = 4500m[/tex]
A locomotive is pulling 9 freight cars, each of which is loaded with the same weight. The mass of each loaded car is 37,000 kg, and we can neglect friction on these 9 cars. If the train is accelerating forward at 0.81 m/s^2 on a level track, what is the tension in the coupling between the second and third cars?
The tension in the coupling between the second and third cars is 269,730 N.
Tension in the coupling between the carsSince the weight of each car is the same, the applied force on each will be the same and the tension on the coupling between the cars will be the same.
T = F = ma
T = 9(37,000 x 0.81)
T = 269,730 N
Thus, the tension in the coupling between the second and third cars is 269,730 N.
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