) The boy then walks to a village. The displacement from his starting point is (400, -50) m. How much gravitational potential energy did he lose going from the top of the hill to the village?
The boy would lose 25000 Joules going from the top of the hill to the village.
What is potential energy?Potential energy is the energy stored in an object as a result of its position in relative with another object. It is given by:
Potential energy = mass * acceleration due to gravity (g) * height.
g = 10 m/s²
Let us assume the boy has a weight of 50 kg. His starting point is (400, -50) m. This means the hill is 50 m high and 400 m from the village.
Potential energy = 50 * 10 * 50 = 25000 Joules
The boy would lose 25000 Joules going from the top of the hill to the village.
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Which of the following is the most appropriate description of an electric current?
An object is 3.0 cm from a concave mirror, with a focal length of 1.5 cm. Calculate the image distance. Remember to include your data, equation, and work when solving this problem. A concave mirror is shown with curvature positioned at 8 on a ruler that goes from 0 to 14 centimeters. The object is located at 5, and the focal point is located at 6.5.
This question involves the concepts of focal length and mirror formula.
The image distance will be "1 cm".
MIRROR FORMULAThe mirror formula relates the focal length, image distance, and object distance through the following formula:
[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]
where,
f = focal length =1.5 cmp = object distance = 3 cmq = image disance = ?Therefore.
[tex]\frac{1}{1.5\ cm}=\frac{1}{3\ cm}+\frac{1}{q}\\\\\frac{1}{1.5\ cm}-\frac{1}{3\ cm}=\frac{1}{q}\\\\0.667 + 0.333 = \frac{1}{q}\\\\[/tex]
q = 1 cm
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Answer:
The image distance is 3.0 cm
Explanation:
Object distance: 3.0 cm Focal length: 1.5 cm Image distance: ? cm
1/f=(1/ do）+（1/di)
1/1.5=(1/3.0)+(1/x)
(2/3)-(1/3)=1/x
1/3=1/x
x=3.0 cm
The image distance is 3.0 cm.
The driver of a car driving at 72 km/h hits the brakes to stop the car. If the deceleration is 2.0 m/s², calculate the the time needed to stop the car.
HELP ASAP
Answer:
it is preaty simple
Explanation:
72/2=36
i hope, that helps, if no i'm sorry
the period of a pendulum is measured to be 3.00s in the refrence frame of the pendulum.what is the period when measured by an observer moving at a speed of 0.960c relative to the pendulum?
Answer:
Δt = Δτ / (1 - β^2)1/2
Δt is the time observed
Δτ is the proper time (3.00 s)
β = v / c = .96
Δt = 3.00 / (1 - .96^2)^1/2 = 10.7 sec
4. Find the period of a pendulum that is 1.2 m long.
Answer:
2.20 s
Explanation:
[tex]T=2\pi\sqrt\frac{L}{g}=2\pi\sqrt\frac{1.2}{9.8}}[/tex]
T = 2.20 s
Dolphins communicate underwater using sound waves. This is called ________.
A. waving
B. radar
C. wave sensing
D. echolocation
Answer:
D. echolocation
Please mark my answer the brainliest and rate me 5 star and follow meplease please please please please please
Answer:
D. echolocation
Explanation:
Dolphins communicate underwater using sound waves. This is called echolocation
if earth would stop receiving heat and light about 8 min what happen
If the Sun disappeared suddenly, we wouldn't know about it for about 8 minutes ... that's how long it takes for heat and light from the Sun to get here to Earth.
8 minutes after the Sun disappeared, the sky would turn totally black. All plants would immediately stop growing ... including all the plants that people or animals eat to live.
Then, after a few more minutes, we would start to notice that it was beginning to slowly get cooler, and that would continue until Earth was too cold for anything to live on it.
Block 1 is sliding toward identical block 2 on a surface of negligible friction. In situation 1, after the two blocks collide, the block 1 stops and block 2 moves off to the right. It situation 2, the two blocks collide and stick together. Which of the following claims correctly describes the motion of the center of mass of the two-block system and provides reasoning for that claim?
In situation 1, the center of mass never changes its speed, because block 1 is moving before the collision, and block 2 is moving after the collision.
Answer A: In situation 1, the center of mass never changes its speed, because block 1 is moving before the collision, and block 2 is moving after the collision.
A
In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.
Answer B: In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.,
B
In situation 2, the center of mass slows down after the collision but continues to the right, because the blocks are always moving to the right.
Answer C: In situation 2, the center of mass slows down after the collision but continues to the right, because the blocks are always moving to the right.
C
In situation 2, the center of mass slows down after the collision but continues to the right, because the direction of motion of the center of mass never changes direction in a collision.
Answer D: In situation 2, the center of mass slows down after the collision but continues to the right, because the direction of motion of the center of mass never changes direction in a collision.
D
In situation 2, the center of mass has a zero velocity, because the velocity of the center of mass of the system is always zero.
Answer:
Explanation:
Situation 1 describes an elastic collision in which momentum is conserved while situation 2 is an inelastic collision in which momentum is not conserved.
When momentum is conserved, the speed of center of mass will not change. So the correct answer is Answer B: In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.
Answer:
A
Explanation:
Answer A: In situation 1, the center of mass never changes its speed, because block 1 is moving before the collision, and block 2 is moving after the collision.
In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.
Hope it helped~
help me please
explain how to do this if you can
Answer: x = 128°
180° - 52° = 128°
Answer:
128 degrees
Explanation:
A circle has a degree of 360, all around. You can imagine a circle, with the center being where the line intercepts the right angle.
360 = 52 + 38 + 142 + x
360 = 232 + x
128 = x
A 6 volt battery delivers 48 watts to two identical light bulbs that are connected in parallel. Determine the resistance of each bulb.
Answer: 0.75 Ohms
Explanation:
Use the Joule heating law stating that the power is equal to the square of the voltage over the resistance:
[tex]P=V^2/R[/tex]
Plug everything in:
[tex]48=(6^2)/R[/tex]
[tex]R=6^2/48[/tex]
[tex]R=36/48=0.75[/tex]
The flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.27 rad/s^2. It accelerates for 27.5 s, then maintains a constant angular velocity. Calculate the total angle through which the wheel has turned 66.1 s after it begins rotating.
With a constant angular acceleration of 1.27 rad/s^2 and acceleration of 27.5 s, is mathematically given as
[tex]\theta = 1848 radians[/tex]
What is the total angle through which the wheel has turned 66.1 s after it begins rotating?Generally, the angular velocity is mathematically given as
w2 = 0 + 1.27*27.9
w2 = 35.43 rad/s
Therefore
[tex]\theta1 = 0.5*1.27*27.9*27.9[/tex]
[tex]\theta2 = w2*(66.1-27.9)\\\\\ \theta = \theta1 + \theta2[/tex]
[tex]\theta = 1848 radians[/tex]
In conclusion, the total angle is
[tex]\theta = 1848 radians[/tex]
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WHAT MUST BE APPLIED FOR AN OBJECT TO CHANGE ITS MOTION?
Answer:
Force
Explanation:
An applied force affects the motion of an object. An applied force can be a push, pull, or dragging on an object.
- profparis
The Himalayan mountains at the border of the Indo-Australian
and Eurasian plates is caused by a _________ boundary.
A. conservative
B. collision
C. constructive
D. destructive
Which of the following factors affect the motion of an object? (Select all that apply.)
the mass of the object
the friction involved
the gravity pulling on the object
the amount of force applied to the object
Answer:
The mass of the object.
The friction involved.
The amount of force applied to the object.
The gravity pulling on the object.
Explanation:
I think that all answers are correct with the right explanation.
the mass is what is pulled on by gravity to determine weight.
friction opposes motion.
gravity pulls everything to the earth's centre
force makes an object to either stop, change direction or increase the velocity of an object depending on the amount.
There are two bulb with different watts. A bulb has heigher wattage than B.
Which will shine brighter in :-
series
parallel
A solenoid has 450 loops, each of radius 0.0254 m. The field increases from 0T to 3.00 T in 1.55 s. What is the EMF generated in the coil?
Answer:
-1.76
Explanation:
emf=-1.76V
Sally is investigating electromagnets. She is going to change the number of turns on the coil of
wire and investigate how this affects the strength of the electromagnet.
a I Name one variable Sally must keep the same each time she tests her electromagnet.
Answer:
The number of turns in a coil
Explanation:
1. A projectile massing 2000 kg is launched at a 42 degree angle to the horizontal with initial velocity of 1000 m/s. Ignoring air resistance:
a. find the range
b. find the max height
c. find the time of flight
What is an isotope?
A) Atoms of the SAME element that have different numbers of NEUTRONS.
B) Atoms of DIFFERENT elements that have different numbers of NEUTRONS.
C) Atoms of the same elements that have DIFFERENT numbers of PROTONS.
D) Atoms of the DIFFERENT element that have DIFFERENT numbers of PROTONS.
Please help me!!
:)
10 Points!
Answer:
A
Explanation:
they are atoms of the same element that have the same number of protons but different number of neutrons.
In rock climbing, various rope and pulley systems have been devised to help haul up heavy loads, including injured climbers. A rescuer is hauling up an injured climber who weighs 930 N using the rope and pulley system shown in (Figure 1). (The ropes in this figure are drawn at various angles for clarity, but you can assume they're all vertical.) What is the tension in rope 1, the rope that the rescuer pulls on? What is the tension in rope 2?
The tension in ropes 1 and 2 is mathematically given as
a)T1=310N
b)T2=610N
What is the tension in ropes 1 and 2?Question Parameters:
A rescuer is hauling up an injured climber who weighs 930 N
Generally, from the diagram, we see that the respective Tensions is mathematically given as
T2=2T1
Where
T1+T2=930
3T1=930
T1=310N
In conclusion, the tension in rope 2
T2=2T1
T2=2*310
T2=610N
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How would a speed bump change the results of a car collision - Newtons Third Law
Answer:
the speed bump would slows down the car 40% of most vehicles. speeding cars would deterred. this would result in fewer accidents.
Which statement best describes how the phase of the Moon changes from a nev, moon to a
а
full moon?
The phase of the Moon changes from new Moon to a full Moon when the Moon moves around the earth until it is between the Sun and the Earth.
What is the Moon?The moon is a large massive body which is found in orbits around the earth.
The moon is said to be the satellite of the earth and orbits the earth in the form of a moon cycle or phases.
The moon cycle occurs when the move moves around the earth from the full moon to a new moon.
Therefore, the phase of the Moon changes from new Moon to a full Moon when the Moon moves around the earth until it is between the Sun and the Earth.
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#SPJ1
Calculate the average acceleration of a car that changes speed 0 m/s to 15 m/s in 5 s
Answer:
Explanation:
average acceleration= (15-0)/5
=15/5
3ms-2
A 25 kg sled is pulled across a horizontal surface by a 200 N force at a constant velocity. What is the coefficient of friction between the sled and the surface?
Answer:
0.82
Explanation:
constant velocity.means acceleration a = 0, so net force = 0
F - μmg = ma = 0
so μ = F/(mg) = 200/(25*9.8) = 0.82
what is photography ??
Answer:
Photography is the art, application, and practice of creating durable images by recording light, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film.
Explanation:
In the definition of photography:
the art or process of producing images by the action of radiant energy and especially light on a sensitive surface (such as film or an optical sensor)
Purpose of photography:
To communicate and document moments in time.
Explanation:
When you take a photograph and share it with others, you're showing a moment that was frozen through a picture. This moment can tell someone many things, from the environment to what people are doing.
Hope this helps you.
Answer:
It's an art or an application of clicking photos .
find the image of (4 "-1)" obtained by translating 4 units up followed by a reflection over the y-axis
Answer:(-4,3)
Explanation: They didn’t show the whole graph so it looks confusing but it’s not.
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance?
The work done on the mouse by air resistance is equal to 196 Joules.
Given the following data:
Mass = 200 grams to kg = 0.2 kg.
Distance = 100 meters.
Scientific data:
Acceleration due to gravity = 9.8 [tex]m/s^2[/tex]
How to calculate work done.In Science, work done is generally calculated by multiplying force and the vertical distance or displacement experienced by an object.
Mathematically, work done is given by the formula:
[tex]Work\;done = force \times displacement = mgh[/tex]
Substituting the given parameters into the formula, we have;
[tex]Work\;done = 0.2 \times 9.8 \times 100[/tex]
Work done = 196 Joules.
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A ball is moving up a hill at 20 meters per second, and is decelerating at a uniform rate of 2 meters per second squared. What is its velocity after 5 seconds? Assume the direction up the hill is positive.
Answer:
-12meters per secondExplanation:
2^5=32-20=-12 meters per sec (going backwards).
If this is correct pls mark me. brainly to let me know, tyy C:
A hurricane that has winds between 74 and 95 miles per hour and causes some damage would be classified as a Category _______ storm.
1
3
2
4
Answer:
Category 1
Explanation:
I hope this helps
Answer: CAT-1
Explanation: