Answer:
The work done by the worker on the object is 255 J
Explanation:
Work is defined as the force that is applied on a body to move it from one point to another.
When a net force is applied to the body or a system and this produces displacement, then that force is said to perform mechanical work. This work can be positive if the system gains energy or negative if the system loses energy.
In the International System of Units, work is measured in Joule. Joule is equivalent to Newton per meter.
The work is equal to the product of the force by the distance and by the cosine of the angle that exists between the direction of the force and the direction that travels the point or the object that moves.
In this case, the angle between the force and the displacement is 0 degrees. Then the cosine of 0 degrees will have a value of one. So work is calculated as the multiplication between force and distance:
W= 17 N* 15 m
Solving:
W= 255 J
The work done by the worker on the object is 255 J
2. Which of the following wavelength properties would require a stopwatch to measure?
A wavelength
B amplitud
C frequency
D height
Answer:
A. wavelength
Explanation:
The others are about sound and how high it is. That has nothing to do with time.
Question : Which of the following wavelength properties would require a stopwatch to measure ?
A - wavelength
B- amplitude
C- frequency
D- height
MY ANSWER : C- FREQUENCY
MWAHHH LOVE - HAVE A RESTFUL NIGHT !
How can circular motion be accelerated when speed is constant?
A. Because of the accelerator pedal in the vehicle
B. Because Newton said
C. Because direction changes
D. Because the vehicle has circular wheels
Answer:
Correct answer is C: Because direction changes.
Explanation:
Hope you have a wonderful weekend.
WILL GIVE BRAINLIEST
The first, fourth, and fifth answers are correct.
When a tree sloth is moving up a tree trunk with a velocity of 0.743 m/s, how long would it take the sloth to travel 22.30 meters?
Answer:
30.0 s
Explanation:
i found the answer
The speed of a wave is 70 m/s. If the wavelength of the wave is 0.4
meters, what is the frequency of the wave?
Answer:
dont know still in 7gd
Explanation:
Answer:
Leo no i dont ansver
Explanation:
ezgisu0613062011 http ()/_
Brainliest and a bunch of points- plz help! Also add explanation
Answer:
i believe it's the first one
Explanation:
i'm not entirely sure but i hope this helps :) have a nice day !!
which best explains why offspring created through sexual reproduction have greater variation than those created through asexual reproduction
Answer:
its fun
Explanation:
I like fun OWo
The musical tone a piano has a frequency of 346HZ and a wavelength of 1.3 M what is the speed of the sound
Answer:
v= 449.8 m/s
Explanation:
Given data
Frequency= 346Hz
Wave length= 1.4m
The expression below is used to find the speed
[tex]v= f \lambda\\\\[/tex]
substitute
[tex]v= 346*1.3\\\\v= 449.8 m/s[/tex]
Hence the speed is v= 449.8 m/s
What is the name of this muscle?
Answer:
shoulder
it is at the shoulder region
Explanation:
shoulder
What is the number used as the Gravitational Constant?
Answer:
G is called the constant of gravitation and is equal to 6.67 × 10−11 newton-metre2-kilogram−2.
Explanation:
Examples of electric forces?
Answer:
Explanation:
The examples of electric force are
The charge in a bulb.
Electric circuits.
Static friction between cloth when rubbed by a dryer.
The shock that is felt after touching a doorknob.
Balanced equations account for the conservation of mass.
Please select the best answer from the choices provided
T
F
Answer:
fff
Explanation:
f
Answer:
True
Explanation:
A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow
A- Lunar Eclipse
B- Neap Tide
C- Spring tide
D-Solar tide
D Solar tide
Explanation:
Because d is closer to the sun
A. Ears
B. Air
C. Water
D. Rocks
Answer:
A Ears
Explanation:
hgvjjghingyjbvh
Can we track the movement of energy in nature
Two examples of inventions that increase friction?
Answer:
My hard pp...............
Explanation:
Please help me please I need someone to help me with all this question 1) How do we calculate the momentum of a race car? What part of this changes during a collision? 2) What happening to the momentum of the car when they crash? 3) how does impulse factor into this? 4) what type of collision is it ( ideally) when cars crash into this SAFER barrier?
Answer:
Explanation:
1 ) Momentum of a race car = mass of car x velocity of car . During a collision , an external force acts on the car which changes the momentum of the car in the direction in which force acts .
2 )
The momentum of the car decreases as external force acts against the momentum . Sometimes when external force is very high , direction of momentum is reversed .
3 ) Impulse is force x time of action of force . Generally time of action of force in large collision is very small . so it is calculated very carefully .
Impulse = change in momentum .
4 ) The type of collision is inelastic . In this type of collision , car crashes into safer barrier , sticks to it . It does not rebound from the barrier . In case of elastic collision , rebound creates large impulse creating huge damage to the car .
Engineers at the Space Centre must determine the net force needed for a rockets engine to achieve an acceleration of 70 m/s2. Assume the rocket is in outer space with no gravitational or other forces acting on it. If the mass of the rocket is 45 000 kg, what force is required to be produced by the rocket engines?
Answer:
3,150,000N
Explanation:
According to Newton's second law;
F = mass * acceleration
Given
Mass = 45000kg
acceleration = 70m/s^2
Substitute
F = 45000 * 70
F = 3,150,000N
Hence the force required to be produced by the rocket engines is 3,150,000N
Answer:
3,150,000 Newtons
Explanation:
F=M*A
F=45,000kg times (*) 70 m/s squared
F=3,150,000N (newtons)
HELPPP PLEASE I GIVE BRAINLIST
handles on kitchen stove pots are usually made of wood mainly because of ?
A ) Conduction
B ) Convection
C ) Radiation
D ) Condensation
Answer:
(B) Conduction
Explanation:
Answer:
a ) conduction
Explanation:
it's a because if u think about it a conductor keeps the heat from getting to a certain part of the metal
Describe how a magnetic field moves in a magnet. plz help!!
Answer:
In a permanent magnet, the magnetic field comes from the motion of the electrons inside the material, or, more precisely, from something called the electron spin. The electron spin is a bit like the Earth spinning on its axis. The magnetic field is a vector, the same way the electric field is.
Explanation:
What were the organic compounds Professor Wadhwa found and why are they important?
Answer:
Organic compounds are important because all living organisms contain carbon. They are the basic components of many of the cycles that drive the earth. For example, the carbon cycle that includes the exchange of carbon between plants and animals in photosynthesis and cellular respiration.
What are the two forces that are acting on the skydiver? What is
the relationship between these two forces? Explain.
Answer:
Gravity provides a downward force, resulting in the diver going downward. They speed up like any falling object would, the pull of gravity is a dominant force. (There is a drag force – as a result of moving through the air.)
The specific heat capacity of copper is 390 J/Kg AC. What does this
mean?
Answer:
It means that 400 J of heat is the required amount to raise or lower thh temperature of a 1kg piece of copper
Explanation:
390 J/Kg °C specific heat capacity of copper means, 390 J of energy is required to raise the temperature of 1 kg of copper by 1 °C
From the given information,
The specific heat capacity of copper is 390 J/Kg °C. To determine what this means, we will define the term specific heat capacity.
The specific heat capacity of a substance is the amount of energy required to raise the temperature of 1 kg of the substance by 1 °C.
Therefore, 390 J/Kg °C specific heat capacity of copper means, 390 J of energy is required to raise the temperature of 1 kg of copper by 1 °C.
Hence, 390 J/Kg °C specific heat capacity of copper means, 390 J of energy is required to raise the temperature of 1 kg of copper by 1 °C.
Learn more here: https://brainly.com/question/20879870
What is a set in Gym?
Answer:
repetitions of a certain exercise
Explanation:
calculate the power used by a 40kg man if he climbs a 6m tall ladder in 15 seconds
Answer:
(i)
Force of gravity acting on the boy = mg
= 40 * 10
= 400 N
(ii)
Work done by him = mgh
= 40 * 10 * 0.08
= 32 J
(iii)
Power = Work / Time
= 32 / 5
= 6.4 Watt
Explanation:
hope this helps
a ball of mass 1kg is being suspended 10m above the ground & is then dropped. what is the balls kinetic energy just before it hits that ground ?
a. 10 J
b. 98 J
c. 50 J
d. 0 J
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".
if you already have the time which is 4s and the initial velocity which is 9.8m/s and the acceleration which is -9.8m/s/s. what would the dispacement be?
Answer:10
Explanation:
2+2=10
Answer:
10
Explanation:
2+8=10
6+4=10
5+5=10
7+3=10
9+1=10
3+2+4+1=10
What is the number of
Protons-
Electrons-
Neutrons-
that are in bismuth?
Explanation:
Number of :
Protons - 83
Neutrons - 126
Electrons - 83
In Bismuth.
Also it has a atomic mass of 208.98038 units.
pls help answer embed
Answer:
C = 1.01
Explanation:
Given that,
Mass, m = 75 kg
The terminal velocity of the mass, [tex]v_t=60\ m/s[/tex]
Area of cross section, [tex]A=0.33\ m^2[/tex]
We need to find the drag coefficient. At terminal velocity, the weight is balanced by the drag on the object. So,
Weight of the object = drag force
R = W
or
[tex]\dfrac{1}{2}\rho CAv_t^2=mg[/tex]
Where
[tex]\rho[/tex] is the density of air = 1.225 kg/m³
C is drag coefficient
So,
[tex]C=\dfrac{2mg}{\rho Av_t^2}\\\\C=\dfrac{2\times 75\times 9.8}{1.225\times 0.33\times (60)^2}\\\\C=1.01[/tex]
So, the drag coefficient is 1.01.
A 13.0km bucket is lowered vertically by a rope in which there is 170N of tension at a given instant. Determine the magnitude of the acceleration of the bucket. Is it up or down?
Answer:
13.07m/s2 down
Explanation:
I think the equation would be
Fnet/m=a
since tension is the only force mensioned that means that
170N/13.0kg=13.07 m/s2 down
acceleration is down