Answer:
The change in gravitational potential energy is -1.80x10⁵ J.
Explanation:
The change in gravitational potential energy is given by:
[tex] \Delta E_{p} = E_{p_{f}} - E_{p_{i}} [/tex]
[tex] \Delta E_{p} = mgh_{f} - mgh_{i} [/tex]
Where:
"i" is for final and "f" for final
m: is the mass
g: is the gravity = 9.81 m/s²
h: is the height
For the car and the passengers we have:
[tex] \Delta E_{p} = m_{T}g(h_{f} - h_{i}) = (750 kg + 135 kg)9.81 m/s^{2}(0 - 20.7 m) = -1.80 \cdot 10^{5} J [/tex]
The minus sign is because when the elevator car and the passengers are up they have a bigger gravitational potential energy than when they are in the ground.
Therefore, the change in gravitational potential energy is -1.80x10⁵ J.
I hope it helps you!
could anyone solve this...its kinda urgent.
Answer:
1) A = lost volts, B = lower, C = a small pressure, D, = Newtons kg, E = Modulation.
2) A = True(?), B = true, C = True, D = True, E = not sure sorry.
Explanation:
Define pressure in short
Answer:
hope it helps......
Explanation:
Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.
please help me out ! I will be marking brainliest! thanks! <3
Answer:
#1. decrease
#2. increases
#3. increases
#4.increases
Explanation:
A car drives 16 miles south and then 12 miles west. What is the magnitude of the car's displacement?
04 miles
16 miles
20 miles
28 miles
Answer:
The answer is 20 miles
Explanation:
You would use a^2+b^2=c^2 to get the displacement.
So 16^2+12^2=c^2
400=c^2
c=20
WHAT IS THE NET FORCE (CENTRIPETAL FORCE) FOR A 1500 KG
CAR DRIVING 5 M/S AROUND A CURVE, 10 M IN RADIUS?
do all objects have inertia
a) true
b) false
Answer:
The answer is A. Which is true
The vehicles are fitted with shockers why
Shockers acts as a shock absorber in the vehicle making the ride comfortable. When vehicle goes on rough road then it gets shocks from the road deformities the springs present in the shockers provide counter force and thus making the vehicle stable ride without shock.
[I copied this from the internet, but hope it helps!]
One model of tennis ball launcher has advertised that it is capable of
imparting 15,000 J of kinetic energy to a 0.5 kg ball initially at rest. A
student carefully measures the compression of the spring to be 0.10 m-
What is the value of the spring constant for the tennis ball launcher
according to the data provided?
Answer:
The answer for the first question is: 3,000,000 N/m
The answer for the second question is: If the question was, "Which of the following is the best example of kinetic energy being transformed into potential energy?" then the answer is winding the spring on a toy car
Explanation:
For the first question: I have no explanation, I just got it right on my test so I thought i'd help you out.
For the second question: (i'll try to explain the best I can).
Kinetic energy = energy in motion
Potential energy = stored energy
so when winding the spring of a car you are using energy in motion (kinetic energy) to create stored energy (potential energy) that will be used to move the car. So it goes something like:
kinetic energy > potential energy > kinetic energy
Please help!
Tell me types of minor sports except football,
basketball,volleyball,
handball,rugby and waterpolo
ice hokey, indoor soccer
Discribe the law of reflection
Answer:
the angle of reflection equals the angle of incidence—θr = θi. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface.
Explanation:
A microscope uses a mirror to reflect light to the specimen under the microscope. ... An astronomical reflecting telescope uses a large parabolic mirror to gather dim light from distant stars. A plane mirror is used to reflect the image to the eyepiece.
Tsunami waves are caused by earthquakes in the ocean floor. As the waves approach the shore, they usually grow in height. When this occurs, which aspect of the wave is changing?
A. amplitude
B. direction
C. frequency
D. speed
E. wavelength
Answer:
LETTER A. AMPLITUDE
:)
Answer:
A
Explanation:
A tennis ball is hit with a speed of 30 m/s at an angle of 40 degrees above the horizontal. What is the range of the ball?
Answer:
90.44 m
Explanation:
From the question given above, the following data were obtained:
Initial velocity (u) = 30 m/s
Angle of projection (θ) = 40°
Acceleration due to gravity (g) = 9.8 m/s²
Range (R) =?
The range of the ball can be obtained as follow:
R = u² Sine 2θ / g
R = 30² Sine (2×40) / 9.8
R = 900 Sine 80 / 9.8
R = 900 × 0.9848 / 9.8
R = 886.32 / 9.8
R = 90.44 m
Therefore, the range of the tennis ball is 90.44 m
A weight lifter holds a 800 newton barbell over his head at a height of 6 meters. How much work does the weight lifter do on the barbell?
A. 4800 J
B. 0 J
C. 4800 W
D. 0 W
Answer:
B. o J
hope it helps......
Answer:
A. 4800J
Explanation:
use the formula of work u also can get answer
Why is thermal energy from the Sun transferred to Earth through electromagnetic waves instead of any other type of thermal energy transfer?
Electromagnetic waves can carry energy through matter.
Electromagnetic waves can travel through empty space.
Electromagnetic waves can move through gases faster than other types of energy transfer.
Electromagnetic waves can move more energy than other types of energy transfer.
Answer:
Electromagnetic waves can travel through empty space.
Explanation:
Electromagnetic waves are defined as the waves that are created due to the vibrations between a magnetic field and an electric field.
Earth atmosphere is made up of several gases and spaces between them. Thermal energy from the sun require to pass through space by electromagnetic radiation. Electromagnetic waves can travel through empty space and that is why other type of waves are unable to transfer thermal energy.
Hence, the correct answer is "Electromagnetic waves can travel through empty space".
Answer:
Electromagnetic waves can travel through empty space.B.Explanation:
the valency of oxygen is 2
Answer:
Yes the valency of oxygen is 2
according to Newton's first law of motion an object at rest will remain at rest and an object in motion will continue to move at a constant velocity because of net force are
A balanced
B unbalanced
C acting in Paris
D the same
Answer:
i think its b
Explanation:
its been awhile since I've worked on Newton's first law
A student who weighs 500 N on Earth travels to a planet whose mass and radius are twice that of Earth. His weight on that planet is about
A. 1000 N
B. 500 / V2 N
C.500 N
D. 250 N
Answer:
B
Explanation:
Weight of the student on that planet is about 250 N. option (D) is correct.
What is Newton’s universal law of gravitation?Newton's universal law of gravitation states that the force of attraction between any two bodies is inversely proportional to the square of the distance between them and directly proportional to the product of their masses.
Let the mass of the student be m.
Mass of the Earth = M.
Radius of the Earth = R,
So, gravitational force applied on the student on Earth surface :
GMm/R² = 500 N.
Again,
mass of the planet = 2M
Radius of the planet = 2R.
So, gravitational force applied on the student on the surface of the planet = G(2M)m/(2R)²
= 1/2 {GMm/R²
= 1/2 × 500 N
= 250 N.
Hence, His weight on that planet is about 250 N. option (D) is correct.
Learn more about gravitational force here:
https://brainly.com/question/3009841
#SPJ2
2. A lever has efficiency 60% and mechanical advantage 4, then
(i) Calculate effort required to lift 1000 N load. [250 N] (ii
(ii) Calculate velocity ratio of the lever. [VR = 6.66]
(iii) Find out output work to turn load up to 20 m. [20,000 Nm]
1:0
Answer:
(i) Effort = 250 N
(ii) Velocity ratio = 6.667
(iii) work output = 20 000 Nm
Explanation:
Given: efficiency = 60%, mechanical advantage = 4.
(i) Mechanical advantage = [tex]\frac{Load}{effort}[/tex]
Load = 1000 N
⇒ Effort = [tex]\frac{Load}{Mechanical advantage}[/tex]
= [tex]\frac{1000}{4}[/tex]
= 250 N
Effort = 250 N
(ii) Efficiency = [tex]\frac{Mechanical advantage}{velocity ratio}[/tex] x 100%
Velocity ratio = [tex]\frac{Mechanical advantage}{Efficiency}[/tex] x 100%
= [tex]\frac{4}{60}[/tex] x 100
= 6.667
Velocity ratio = 6.667
(iii) Work output = Load x distance moved by load
= 1000 x 20
= 20 000
Work output = 20 000 Nm
You get a job delivering water. You calculate how much work is done picking up each 20 L bottle of
water and raising it vertically 1 m. For every 100 bottles you deliver, you will use Select.... (g =
9.8 m/s2)
-196J
-2,000 J
-19,600 J
-196,000J
Answer:
The work done by picking up 100 20-L bottles and raising it vertically 1 meter is 19614 joules.
Explanation:
By the Work-Energy Theorem, the work needed to raise vertically 100 bottles of water is equal to the gravitational potential energy, units for work and energy are in joules:
[tex]\Delta W = \Delta U_{g}[/tex] (1)
Where:
[tex]\Delta W[/tex] - Work.
[tex]\Delta U_{g}[/tex] - Gravitational potential energy.
The work is equal to the following formula:
[tex]\Delta W = n\cdot \rho \cdot V \cdot g \cdot \Delta h[/tex] (2)
Where:
[tex]n[/tex] - Number of bottles, dimensionless.
[tex]\rho[/tex] - Density of water, measured in kilograms per cubic meter.
[tex]V[/tex] - Volume, measured in cubic meters.
[tex]g[/tex] - Gravitational acceleration, measured in meters per square second.
[tex]\Delta h[/tex] - Vertical displacement, measured in meters.
If we know that [tex]n = 100[/tex], [tex]\rho = 1000\,\frac{kg}{m^{3}}[/tex], [tex]V = 0.02\,m^{3}[/tex], [tex]g = 9.807\,\frac{m}{s^{2}}[/tex] and [tex]\Delta h = 1\,m[/tex], then the work done is:
[tex]\Delta W = (100)\cdot \left(1000\,\frac{kg}{m^{3}} \right)\cdot (0.02\,m^{3})\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot (1\,m)[/tex]
[tex]\Delta W = 19614\,J[/tex]
The work done by picking up 100 20-L bottles and raising it vertically 1 meter is 19614 joules.
How long will it take an object to move 50 meters if the object is traveling with an average speed of 2 meter per second? (Answer to the nearest 100th decimal with units)
Answer:
26
Explanation:
Please answer faast!!!
Answer:
Any medium or material of high refractive density e.g Water which refracts the light rays 1&2 away from their normal
What are the properties of a concave mirror
Answer:
Concave mirrors produce real and virtual images.
Explanation:
(Concave mirrors can produce both real and virtual images)
They can be upright (if virtual) or inverted (if real)
They can be behind the mirror (if virtual) or in front of the mirror (if real)
T hey can also be enlarged, reduced, or the same size as object.
Answer:
Some properties of the given mirror are summarized in the below portion.
Explanation:
Unless the material is dropped between some of the focus as well as the mirror:Throughout that particular instance, the ground image component is immersive but instead larger than those of the attribute and it has a similar orientation as the attribute.
Unless the object is located between some of the center point of that same mirror as well as the focus area:Throughout this particular instance, the mirror version is genuine and larger than that of the attribute. In additament, the image formation was therefore reversed.
give the relation of resistance of wire with the length and thickness.
Answer:
The answer to this question is given below in the explanation section.
Explanation:
Give the relation of resistance of wire with the length and thickness:
Resistance:
There is a resistance to the flow of an electric current through most conductors.
The length of wire increases
The thickness of wire decreases
The resistance of a long wire is greater then the resistance of a short wire because electrons collide with more ions as they pass through.
The relationship between resistance and wire length is proportional. The resistance of thin wire is greater then the resistance of a thick wire because a thin wire has fewer electrons to carry the current.The relationship between resistance and the area of the cross section of wire is inversely proportional.
find the ratio of the lengths of the two mathematical pendulums, if the ratio of periods is 1.5
Answer:
The ratio of lengths of the two mathematical pendulums is 9:4.
Explanation:
It is given that,
The ratio of periods of two pendulums is 1.5
Let the lengths be L₁ and L₂.
The time period of a simple pendulum is given by :
[tex]T=2\pi \sqrt{\dfrac{l}{g}}[/tex]
or
[tex]T^2=4\pi^2\dfrac{l}{g}\\\\l=\dfrac{T^2g}{4\pi^2}[/tex]
Where
l is length of the pendulum
[tex]l\propto T^2[/tex]
or
[tex]\dfrac{l_1}{l_2}=(\dfrac{T_1}{T_2})^2[/tex] ....(1)
ATQ,
[tex]\dfrac{T_1}{T_2}=1.5[/tex]
Put in equation (1)
[tex]\dfrac{l_1}{l_2}=(1.5)^2\\\\=\dfrac{9}{4}[/tex]
So, the ratio of lengths of the two mathematical pendulums is 9:4.
HELP PLS i need this
Answer:
here you have to find the range
Explanation:
[tex]range=\frac{u^{2}sin2\theta }{g}[/tex]
[tex]\frac{4.22^{2} * sin2(63) }{10}[/tex]
1.4431m
How much power does a machine have that does 15204 J of work in 40 seconds?
Explanation:
since P=W/t
P=15204/40
P=380.1 Watt
I need help with questions #2 and #3
Answer:
Im sorry i can't read it is to small
Ifa cup of coffee is at 90°C and a person with a body temperature of 36°C touches it, how will heat flow between
them?
O from the hand to the cup
O from the cup to the hand
O from the cup to the surrounding air
O from the hand to surrounding air
A weather balloon is inflated with 0.80 m3 of helium (He) at ground level (pressure is 1.0 atm). The balloon is released and rises into the air. What is the atmospheric pressure when the gas in the balloon expands to a volume of 3.32 m3?
Answer: 0.24 atm
Explanation:
To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is directly proportional to the volume of the gas at constant temperature.
The equation given by this law is:
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 1.0 atm
[tex]V_1[/tex] = initial volume of gas = [tex]0.80 m^3[/tex]
[tex]P_2[/tex] = final pressure of gas= ?
[tex]V_2[/tex] = final volume of gas = [tex]3.32m^3[/tex]
Putting values in above equation, we get:
[tex]1.0\times 0.80m^3=P_2\times 3.32m^3[/tex]
[tex]P_2=0.24atm[/tex]
Thus the atmospheric pressure of the gas is 0.24 atm
in which unit is atmospheric pressure measured?
Answer:
Originally Answered: What is the unit of measurement of pressure in the atmosphere? The SI derived unit of pressure is the pascal , abbreviated Pa. This is a pressure exerted by a force of 1 newton acting over an area of 1m².
Explanation:
Hope this helps you a lot my boo!