Answer:
E = 98 J
Explanation:
Given that,
The mass of a ball, m = 1 kg
It is being suspended 10m above the ground & is then dropped.
We need to find the ball's kinetic energy just before it hits that ground. The conservation of energy holds here. It means, the kinetic energy just before it hits that ground is equal to its potential energy i.e.
[tex]E=mgh\\\\E=1\times 10\times 9.8\\\\E=98\ J[/tex]
so, the required energy is 98 J. Hence, the correct option is (b) "98 J".
Of the following reactions, which is a fusion reaction?
a.
uranium-235 absorbing a neutron and splitting into xenon-140, strontium-94, and two neutrons
b.
hydrochloric acid combining with sodium hydroxide to form a salt and water
c.
carbon-14 decaying into nitrogen-14 and a beta particle
d.
curium-246 combining with carbon-12 to form nobelium-254 and four neutrons
Answer:
Option D is correct.
Explanation:
It is fusion reaction.because curium combines with carbon to form a big nuclei of nobelium.[tex]Cm_{246} +C_{12}[/tex] → [tex]No_{254}[/tex]
Hence, it is the fusion reaction.
What is fusion?When two or more nuclei fuse together to form a heavy nucleus with the energy released, is called fusion.
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A 10 kg cart is attached to a rope that forces the cart to travel along a circular path. The rope has a length of 2.7 meters and has a rotational speed of 2.0 rotations per second.
Answer:
F = 4361.7 N
Explanation:
In this exercise the force of the string is asked, to solve it we use Newton's second law
F - W = m a
force is the tension of the rope
the centripetal acceleration is
a = v² / r
the angular and linear speed are related
v = w r
let's substitute
F - mg = m w² r
F = m (g + w² r)
let's reduce the magnitudes to the SI system
w = 2.0 rot / s (2π rad / 1 rev) = 4π rad / s
let's calculate
F = 10 (9.8 + (4π)² 2.7)
F = 4361.7 N
A longitudinal wave is transporting energy from south to north. the particles in the medium will move...
east only
north and south only
north only
east and west only
30 POINTS PLEASE HELP
Answer:
north only
Explanation:
overall force acting on an object.
Answer:
Gravity
Explanation:
Gravity is a force that acts upon every single object on Earth.
A 8.0 kg bowling ball moves at 3.0 m/s. Calculate the kinetic energy of the ball?
Answer:
Explanation:
KE = 1/2mv^2
=1/2(8)(3^2)
=4*9
=36 Joules
If the Sun were the size of a small exercise ball (about 0.5 meters (m) in
diameter) and if Jupiter were the size of a golf ball, how big would Earth be
on this scale?
Answer:
the size of a pea
Explanation:
Does an explicit formula for a sequence make sense assuming n = 2.5? Explain
Choose the correct answer below
O A. It makes sense, but only if the term for n = 2.5 is an integer
OB. It does not make sense since n is the term number. It is not possible to have a term between the second and third terms.
OC. It makes sense since n is a variable, and variables can be any real number
OD. It does not make sense since n can be negative or positive but must be an integer.
Answer:
c
Explanation:
tbh I think it is c because of what the explanation says so
Answer:
D
Explanation:
because i got it right when guessing its d
What is the station 2 code for cupids spread the love escape room?
Answer:CADB
Explanation:
From the simulation and the readings that you may have recorded, what do you observe about the relation between period and frequency?
Answer: The speed of the wave appears to be constant. This is because the speed of sound depends only on the properties of the medium, and the medium is the same.
Explanation: The answer is from edmentum. Just letting you know on what not to copy and paste. Change it up.
After running for a while, the fan becomes hot to the touch, and ever so often releases ___________________ energy into the air.
*Note* Another form of energy is released from the kettle. What is it? ______________
Answer:
thermal
Explanation:
A wave has a period of 2 seconds and a wavelength of 4 meters. Calculate its frequency and speed. Note: Recall that the frequency of a wave equals 1/period & the period of a wave equals 1/frequency.
Answer:
frequency = 0.5 Hz and speed = 2 m/s
Explanation:
Given that,
The period of a wave, T = 2 s
Wavelength, [tex]\lambda=4\ m[/tex]
If f be the frequency. So,
f = 1/T
[tex]f=\dfrac{1}{2}\\\\f=0.5\ Hz[/tex]
Speed of a wave is given by :
[tex]v=f\lambda\\\\v=0.5\times 4\\\\v=2\ m/s[/tex]
So, the frequency of the wave is 0.5 Hz and speed is 2 m/s.
What season would it be for someone living near locaton 3 on the Earth?
Fall
Winter
Summer
Spring
Answer:
It would be summer for someone living near location 3 on the Earth.
Explanation:
Calculate the kinetic energy of a 2kg ball moving at 5m/s
Answer:
25
Explanation:
The kinetic energy is 25
2. A 7.0 kg box, which is initially at rest at the bottom of a frictionless ramp, is pulled up the ramp by a string
When it reaches a height of 2.0 m, the box is moving at 6.0 m/s. It takes 2.0 seconds for the box to reach this height.
a) Calculate the work done by the string in pulling the box
up
the
ramp.
b) Calculate the power exerted by the string in pulling the box up the ramp.
Answer:
a) The work done in raising the block up to 2.0 m is 137.2 joules
b) The power exerted by the string in pulling the box up the ramp is 68.6 watts
Explanation:
The question examines the relationship between work energy and power
The parameters of the pulled box are;
The mass of the box, m = 7.0 kg
The height to which the box is pulled, h = 2.0 m
The velocity at which the box is moving at the 2.0 m height = 6.0 m/s
The time if takes the box to reach the height of 2.0 m = 2.0 seconds
The acceleration due to gravity, 'g' is taken as approximately 9.8 m/s²
a) The work done in raising the block up to 2.0 m = The potential energy gained by the block
The potential energy gained by the block, P.E. = m·g·h
Therefore, we have;
The work done in raising the block up to 2.0 m = P.E. = m·g·h
By substituting the given values, we get;
The work done in raising the block up to 2.0 m = 7.0 kg × 9.8 m/s² × 2.0 m = 137.2 joules
b) Power = The rate of doing work
∴ Power, P = Work done/(Time takes for the work)
The work done in raising the block up to 2.0 m = 137.2 joules
The time if takes the box to reach the height of 2.0 m = 2.0 seconds
∴ The power exerted by the string in pulling the box up the ramp, 'P' is given as follows;
P = 137.2 joules/(2.0 seconds) = 68.6 watts
The power exerted by the string in pulling the box up the ramp, P = 68.6 watts.
write a description of your best friend
My bestfriend is the best ever person in my life.
Answer:
Best friend is that person which we share our feeling.
Simple Machines
Name the 6 simple machines
What is a joule and how is it abbreviated?
What is an input force?
What is an output force?
Answer:
Name the 6 simple machines
1.Lever
2.Pulley
3.Screw
4.Axle
5.Wedge
6.Inclined plane
What is a joule and how is it abbreviated?
Abbreviation=J
A measurement of energy and work.
What is an input force?
Input force is the amount of effort used to push down on a road or pull on a rope in order to move the weight.
What is an output force?
output force is the force exerted on an object by a simple machine.
Just answer the first one at least
Answer:
D
Explanation: That is the lowest point in a cycle
Answer:
I just had a question the same as this.
The answer is: Points (B) & (F)!
Hope it helps! :D
can someone helppppppppp meeeeeeeeeee plzzzzzz ill give brainliest
what is the the relationship between velocity and gravity?
Answer: When objects fall to the ground, gravity causes them to accelerate.
Explanation: Gravity causes an object to fall toward the ground at a faster and faster velocity the longer the object falls.
The kangaroo stops at a lake for a drink of water, then starts hopping again to the south. After 5 seconds, the kangaroo is going 2.5 m/s south. What is the kangaroo’s acceleration?
Answer:
A kangaroo hops 60 m to the east in 5 s. What is the kangaroo's average velocity? ... The kangaroo stops at a lake for a drink of water and then starts hopping again to the south. Each second, the kangaroo's velocity increases 2.5 m/s.
Atomic energy is produced from changes within the_____ of an atom.
electrons
neutrons
protons
or
necleus
Answer:
Atomic energy is produced from changes within the nucleus of an atom.
Answer:
nucleus
Explanation:
1)the car's engine power is 44000W. Explain this number in a physical sense
...
2)400g masses in April, rising steadily over 20s reaches 100m high. What power is developing in April
...
3)the bullet is fired vertically upwards at a speed of 600 / m / s. to what maximum height it would rise if there were no air resistance
...
Answer:
1) It expresses the rate (top speed) at which it can move with time.
2) P = 20 W
3) h = 18 km
Explanation:
1) Power is the rate of transfer of energy.
⇒ Power = [tex]\frac{Energy(or workdone)}{Time}[/tex]
i.e P = [tex]\frac{E}{t}[/tex]
Thus a car's engine power is 44000W implies that the engine of the car can propel the car at this rate. This expresses the rate (top speed) at which it can move with time.
2) m = 400g = 0.4 kg
t = 20 s
h = 100m
g = 10 m/[tex]s^{2}[/tex]
P = [tex]\frac{mgh}{t}[/tex]
= [tex]\frac{0.4*10*100}{20}[/tex]
= [tex]\frac{400}{20}[/tex]
P = 20 W
3) u = 600 m/s
g = 10 m/[tex]s^{2}[/tex]
From the third equation of free fall,
[tex]V^{2}[/tex] = [tex]U^{2}[/tex] - 2gh
V is the final velocity, U is the initial velocity, h is the height.
0 = [tex](600)^{2}[/tex] - 2 x 10 x h
0 = 360000 - 20h
20h = 360000
h = [tex]\frac{360000}{20}[/tex]
= 18000
h = 18 km
The maximum height of the bullet would be 18 km.
what is the economic system in the united states?
A. Capitalist economy
B. Stock Market economy
C. Global economy
D. Communist economy
Answer:
A. Capitalist economy
Explanation:
The United States is a capitalist economy. Hope this helps, thank you !!
I need help with thisssss
A neutron star is moving in outer space at 4,000 km/hr. What happened to the star that set it in motion on it's current course?
a
the friction in space slowed it down to 4,000 km/hr
b
an unbalanced force from a supernova set it in motion
c
it was shot further into space due to the velocity of objects around it
d
a balanced force acted on it and propelled it to 4,000 km/hr
Answer:
d
a balanced force acted on it and propelled it to 4,000 km/hr
Explanation:
For the neutrons star which is moving in outer space at 4,000 km/hr, it could only be possible as a result of the balanced force which had already acted on it. This is based on newton's law of motion which states that 'To every action, there is equal and opposite reaction'.
How is it possible for the same object to have different amounts of gravitational potential energy?
Answer:
In Newtonian mechanics, the gravitational energy possessed by a mass, because of the gravitational field produced by a second mass.
Explanation:
Determine the acceleration of a car of mass 900 kg, when a net force of 2700 N acts on it.
All music, _______ in the world, is from only ______ notes.
Answer:
All music in the world, is form only two notes and those notes are described below in detailed explanation.
Explanation:
In the chromatic scale, there are basically seven central musical notes, designated A, B, C, D, E, F, and G. They individual express a separate pitch or frequency. For illustration, the "central" A note has a pitch of 450 Hz, and the "common" B note has a pitch of 495 Hz.
Varieties Of Musical Notes You Require To Understand
Semibreve (Whole Note)
Minim (Half Note)
Crotchet (Quarter Note)
All music, listened to in the world, is from only twelve (12) notes.
A music can be defined as the systematic combination of an instrumental sound and human vocals, in order to produce harmonious tunes or sounds.
A note can be defined as a symbol which is used to denote a musical sound with respect to its pitch and duration.
Basically, all the music that are available and listened to in the world are typically produced from only twelve (12) notes.
This ultimately implies that, any musical piece that you may have come across in this world comprises only twelve (12) notes and these include:
1. A2. A#3. B4. C5. C#6. D7. D#8. E9. F10. F#11. G12. G#Read more: https://brainly.com/question/20245998
The moon is lit by light bouncing off of it. That light reaches Earth as ____. The different shapes that the moon appears to have are called ____. The moon goes through ____ phases as it revolves around the ____ every ____ days. The phase that we see depends on how much of the ____ part of the moon we can see. This depends on the positions of the ____, ____, and ____.
Answer:
Moonlight; phases; eight; 29 days; sunlit; earth; sun; moon.
Explanation:
A moon generally do not have or possess light but rather it reflects the light from the sun.
The moon is lit by light bouncing off of it. That light reaches Earth as moonlight. The different shapes that the moon appears to have are called phases. The moon goes through eight (8) phases as it revolves around the earth every 29 days. The phase that we see depends on how much of the sunlit part of the moon we can see. This depends on the positions of the earth, sun, and moon.
The eight (8) phases of the moon include the following;
1. Last quarter half moon.
2. Waning crescent moon.
3. New moon.
4. Waxing crescent moon.
5. First quarter half moon.
6. Waxing Gibbous moon.
7. Full moon.
8. Waning Gibbous moon.
PLEASE HELP ASAP GIVING 33 POINTS FOLLOW ALL THE INSTRUCTIONS