Answer:
85.8 m/s
Explanation:
speed=wavelength multiply by frequency
[tex]0.39 \times 220 [/tex]
[tex]85.8[/tex]
PHYSICS PLEASE HELP
a. Draw a force diagram
b. The skier has a mass of 76.6 kg and the coefficient of kinetic friction between the skier and the snow is 0.15. The angle the hill makes to the horizontal is 38 degrees and the distance the skier glides down the hill is 40.5 m. Answer the following questions based on this information.
What is the magnitude of the normal force on the skier as they glide down the hill? Show your work.
c. What is the magnitude of the force of friction on the skier as they glide down the hill? Show your work.
d. What is the acceleration of the skier as they glide down the hill? Show your work.
e. What is the speed of the skier when they reach the end of the straight section of the hill? Show your work.
f. How many seconds does the skier take to reach the end of the straight section of the hill? Show your work.
Answer:
Explanation:
b )
Normal force R = mgcosθ
= 76.6 x 9.8 x cos 38
R = 591.5 N
c )
Force of friction
= μ R
μ is coefficient of friction .
= .15 x 591.5
= 88.73 N
d )
Net force
= mg sinθ - friction
= 76.6 x 9.8 x sin 38 - 88.73
= 462.16 - 88.73
= 373.43 N
Acceleration = 373.43 / 76.6
a = 4.87 m / s²
e )
v² = u² + 2 a s
s = 40.5 m
a = 4.87
u = 0
v² = 0 +2 x 4.87 x 40.5
= 394.5
v = 19.86 m /s
f )
v = u + a t
19.86 = 0 + 4.87 t
t = 4 .07 s
AGREE OR DISAGREE: All light can be seen.
Answer:
Disagree
Explanation:
We cannot see infared lights.
An electric motor transforms potential energy into mechanical energy.
Please select the best answer from the choices provided
T
F
Answer:
t
Explanation:
Answer:
False
Explanation:
A 1 kg box is sitting on a flat horizontal surface that has a coefficient of static friction value of 0.8. What answer best states the minimum force required to move the box in the horizontal direction?
A. >-9.8N
B. >9.8N
C. >7.84N
D. >9N
The normal force felt by the box has magnitude
F[normal] = (1 kg) g = 9.8 N
so that the maximum magnitude of static friction is
F[s. friction] = 0.8 F[normal] = 7.84 N
In order to get the box to move, (C) a minimum force of 7.84 N is required.
A 120 Ω resistor, a 60 Ω resistor, and a 40 Ω resistor are connected in parallel and placed across a potential difference of 12.0 V. What is the equivalent resistance of the parallel circuit?
Answer:
The equivalent resistance of the parallel circuit would be 20 Ω
Explanation:
To calculate the resistance of resistors connected in parallel, the formula to be used is
1/R = 1/R₁ + R₂ + R₃ + R₄...
1/R = 1/120 + 1/60 + 1/40
1/R = (1 + 2 + 3)/120
1/R = 6/120
1/R = 1/20 Ω
This can be rewritten or cross-multiplied to be
R × 1 = 20 × 1
R = 20 Ω
The equivalent resistance (R) would then be 20 Ω
How much gravitational potential energy does a 1.0 kg hammer have on a shelf 1.5 m above the ground?
Answer:
14.7 J
Explanation:
PE=MGH
PE= 1.0 x 9.8 x 1.5 = 14.7 J
The international space station travels 110,304 km in 4 hours. What is
speed of the ISS in Meters per second. (3600 seconds = 1 hour)
Answer:
7660 m/s
Explanation:
multiply 110304 x 1000 to turn it into meters then turn 4 hours into seconds making it 14400 seconds. Then divide 11030400 by 14400
How would you measure the volume of an oddly shaped object
By breaking the object into tiny pieces and placing them in a beaker
By placing it on a triple beam balance
By placing it in a room without gravity
By placing it in water and measuring how high the water rises
Answer:
By placing it in water and measuring how high the water rises
Explanation:
You can place the object in a can filled with water. You'll then see that as it sits there, the water level rises. You would then measure that to find the volume.
A 150 lb person and a 200 lb person run into each other.
What can you say about force?
Who accelerated the most? Why?
Explanation:
1. Force is something that pushes or pulls you
2. The 150 lbs person accelerated faster because they had less force pushing or pulling them down.
Please helpp !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The diagram below shows an electric circuit with a battery and a bulb.
What energy transformations would occur when the bulb lights?
B. chemical to electrical to light
C. electrical to mechanical to light
D. chemical to electrical to solar
A. light to electrical to chemical
(First answer gets brainliest)
Answer:
B. chemical to electrical to light
The battery holds chemical energy, which is transformed to electrical energy due to flow of electrons.
The electrons due to their drift velocity which heats up the bulb filament hence producing light.
Answer:
B
Explanation:
because i learned in 5th grade
14. How do speed and velocity differ?
Answer:
Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.
Explanation:
Use a ballistic cart to shoot a small ball into the air. Push the cart along a track, allowing it
to release the ball. What explains why the cart always catches the ball, and the ball doesn't
fall behind the moving cart?
Answer:
Explained below.
Explanation:
The ball doesn't fall behind the moving cart because the horizontal motion of the ballistic cart is not affected by the forces that act in the vertical direction. Therefore, when the cart is pushed, it means that the ball will shoot up and then it will land right back in the barrel.
A 1000 kg car’s velocity increases from 5 m/s to 10 m/s. What is the change to the car’s kinetic energy? Show your work.
Answer:
k. e. = 1/2 mv^2
1/2 * 1000 * (5)^2
1/2 * 1000 * 25
12500 joules
k. e. = 1/2 mv^2
1/2 * 1000 * (10)^2
1/2 * 1000 * 100
50000
change in k. e. = final - initial
50000 - 12500
= 37500 joules
hope it helps you
Which of the following can sometimes be zero for a moving body i average velocity ii distance travelled iii average speed iv displacement
Answer:
displacement can be zero...because it only care about initial and final positionshow can an object travel 6 meters if it ends up at -2 on the number line?)
Answer: Distance is a scalar quantity and direction is not applicable. We can use graphs to depict an object's change in position over time. Create a large number line in the classroom by taping index cards on the floor or wall 1 meter apart.
Explanation: I really hope that was helpful.
Rex scored the following marks in 6 subjects:
English - 88
Hindi - 64
Sanskrit - 89
Maths - 96
Science - 87
Social Studies - 80
Find his average score in 6 subjects.
What is the density of a box measuring 100 grams and 10 ml?
Answer:
In order to convert density to grams, you have to put the mass on one side of the equation, and the density and the volume on the other. Therefore, d * v = m. Multiply the density by the volume. Using the example in step 1, you would multiply 2 g/mL by 4mL.
Explanation:
ok
Which of the following statements about Copernicus' heliocentric model of the Solar System are accurate?
It was the first such model was supported by scientific evidence.
It was not published until Copernicus was close to death.
It was the first time a heliocentric model had ever been suggested.
It was not controversial, and was readily accepted.
It stated that the Sun revolved around the Earth.
It stated that the Earth revolved around the Sun.
Answer:
(i) It was the first such model was supported by scientific evidence: FALSE
(ii) It was not published until Copernicus was close to death: TRUE
(iii) It was the first time a heliocentric model had ever been suggested: FALSE
(iv) It was not controversial, and was readily accepted: FALSE
(v) It stated that the Sun revolved around the Earth: FALSE
(vi) It stated that the Earth revolved around the Sun: TRUE
Explanation:
We proceed to demonstrate the validity of each option from statement:
(i) It was the first such model was supported by scientific evidence: FALSE
The geocentric model was based mostly on interpretation of two astronomical findings: (a) The displacement of the stars with respect to Earth due to stellar parallax, (b) The apparent consistency of brightness of the planet Venus seen from Earth.
(ii) It was not published until Copernicus was close to death: TRUE
Copernicus published his heliocentric theory, contained in the book De revolutionibus orbium coelestium, months before his death, in 1543.
(iii) It was the first time a heliocentric model had ever been suggested: FALSE
Greek mathematician and astronomer Aristarchus of Samos was the first person who proposed the heliocentric model in the 4th Century.
(iv) It was not controversial, and was readily accepted: FALSE
The Roman Catholic Church defended geocentric model proposed by Claudius Ptolemy and Tycho Brahe and rejected the model proposed by Copernicus, whose publication was included in the Index Librorum Prohibitorum in 1616.
(v) It stated that the Sun revolved around the Earth: FALSE
This is the main idea of the geocentric model.
(vi) It stated that the Earth revolved around the Sun: TRUE
This is the main idea of the heliocentric model.
What are Alpha rays
please its aurgent
Answer:
An alpha ray is a stream of alpha particles. An alpha particle consists of two protons and two neutrons bound together into a particle identical to a helium nucleus.If you and your friend are playing tug of war and both are you are pulling with the same amount of force. What will happen?
Answer:
Nothin will move, it will stay the same since no force is greater than the other. it's "the same amount of force" which also means an equal amount of force
Explanation:
The forces are only equal if there is no acceleration (which in the game of tug of war, accelerating yourself and your opponent is the idea). If the force on the rope and the ground are both equal either nothing moves or some other force is being applied in the system.
Hope this helped!
They confessed their guilt.
Answer:
heyyy
May I Know the full question
identify the types of simple machine given below .
a)scissors b)axe c)driller
Answer:
there should some picture to identify right?
pls edit your question and insert the picture..
Answer:
Well it depends Because An axe Would be A Simple machine well as a drill is
Which statement about the relationship between air pressure and air density is accurate?
A) Air pressure decreases as air density increases
B) Air pressure increases as air density increases
C) Air pressure increases as air density decreases
D) Air pressure is unrelated to air density
Answer:
A: Air pressure decreases as air density increases
Explanation:
Pressure is a force exerted on or against an object by being in contact with a substance. Thus, air pressure is due to the bombardment of the air (gas) particles with a surface. Density is defined as the mass per volume of a substance. Thus, air density is defined as the mass of air per unit volume.
If that Explanation does not make any sense let me make it easier.
The air at the top of a mountain is cooler than the air at the bottom. This temperature difference is due to a phenomenon that occurs in Earth’s atmosphere. Air rises and sinks based on differences in temperature and pressure. Here’s a quick experiment that will help explain the role of pressure.Take in a deep breath as if you were ready to blow out birthday candles. Puff your cheeks with air like a chipmunk. Hold it for a few seconds, and then blow the air slowly from your cheeks.Cold air sinks while warm air rises because cold air is denser than warm air. When a lot of cold air sinks, it creates an area of high air pressure where it hits the surface. This high-pressure air flows to an area of low pressure, creating wind. When this air warms, it rises up into the atmosphere.Temperature decreases as altitude increases. That’s why a mountain peak may be covered with snow while the bottom of the mountain is full of green plants and trees. When warm air rises into the atmosphere, it cools. The density of the air increases as it cools, which eventually creates an area of high pressure and starts the cycle again.
If not for this phenomenon of air rising and sinking in the atmosphere, there would be no wind or weather.
I hope that helped!
Waves move fastest in
low-temperature gases.
low-temperature solids.
high-temperature gases.
high-temperature solids.
An apple in a tree has a mass of 0.21 kg. If it is 7.2 meters above the ground, how much potential energy does it have?
Answer:
14.8J
Explanation:
PE=MGH
M=0.21
G=9.8m/s
H= 7.2 m
0.21x7.2x9.8= 14.8176 J
A term used to describe a critical assessment of how an athlete acts and what they achieve either during a match or while training is known as:
A. SMART Target
B. Area of improvement
C. Performance analysis
D. Measurement of success
Answer:
I believe D
Explanation:
I'm not for sure but I think it is D
If a net horizontal force of 0.8 N is applied to a toy whose mass is 1.2 kg what acceleration is produced?
Answer:
0.67 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{0.8}{1.2} \\ = 0.666666...[/tex]
We have the final answer as
0.67 m/s²Hope this helps you
Tom drives on a highway and never changes his speed for the whole journey. He drives for 300 miles and it takes him 5 hours. What is Tom's speed on the highway?
Answer:
QESARDFRGTSRTATFREVERSRvrvqwqv
Explanation:
vfqfvcafbraf w rfdsd AEWvd a
a pulley is used to lift a 2000 N safe over frosty's head. the safe is lifted 6m in 4s by Rudolph. how much power did Rudolph use?
Answer:
3000W
Explanation:
Given parameter:
Weight of safe = 2000N
Height of lift = 6m
Time = 4s
Unknown:
Power used by Rudolph = ?
Solution:
Power is the rate at which work is being done. It is expressed as:
Power = [tex]\frac{Work done }{Time taken}[/tex]
Work done = Weight x height = 2000 x 6 = 12000J
Power = [tex]\frac{12000}{4}[/tex] = 3000W