A construction crane, like the one shown, has a power output of 1,500 watts. If it takes 200 seconds to lift the roof to the top of the building, how much energy will the crane use
Answer:7.5j
Explanation:
P=w/s
The speed of a moving bullet can be deter-
mined by allowing the bullet to pass through
two rotating paper disks mounted a distance
61 cm apart on the same axle. From the
angular displacement 14° of the two bullet
holes in the disks and the rotational speed
1436 rev/min of the disks, we can determine
the speed of the bullet.
Answer:
v = 381 m/s
Explanation:
Linear Speed
The linear speed of the bullet is calculated by the formula:
[tex]\displaystyle v=\frac{x}{t}[/tex]
Where:
x = Distance traveled
t = Time needed to travel x
We are given the distance the bullet travels x=61 cm = 0.61 m. We need to determine the time the bullet took to make the holes between the two disks.
The formula for the angular speed of a rotating object is:
[tex]\displaystyle \omega=\frac{\theta}{t}[/tex]
Where θ is the angular displacement and t is the time. Solving for t:
[tex]\displaystyle t=\frac{\theta}{\omega}[/tex]
The angular displacement is θ=14°. Converting to radians:
[tex]\theta=14*\pi/180=0.2443\ rad[/tex]
The angular speed is w=1436 rev/min. Converting to rad/s:
[tex]\omega = 1436*2\pi/60=150.3776\ rad/s[/tex]
Thus the time is:
[tex]\displaystyle t=\frac{0.2443\ rad}{150.3776\ rad/s}[/tex]
t = 0.0016 s
Thus the speed of the bullet is:
[tex]\displaystyle v=\frac{0.61}{0.0016}[/tex]
v = 381 m/s
PLEASEE HELP ASAP !!!!! thank you so so so much!!!! *will give brainliest*
Answer:
Answer a) Force on A equal to force on B
Answer a) The electric field points to the left in the location A
Explanation:
12)
Recall that the magnitude of the electrostatic force is given by:
[tex]F=k\frac{q*Q}{d^2}[/tex]
therefore in magnitude it is the same for charge q than for charge Q.
(Answer a for the first problem - 12)
13)
Recall that the electric filed points outwards for a positive charge, therefore at the location of charge q, the field must be pointing towards the left.
A sample of an unknown metal has a mass of 0.5 kg. Adding 1985 J of heat to the metal raises its temperature by 10 K. What is the specific heat of the metal
Answer:
Cp = 397 [J/kg*K]
Explanation:
By means of the energy equation for heat transfer in substances and objects, we can calculate the specific heat. In this way, we have the following equation.
[tex]Q=m*C_{p}*DT[/tex]
where:
Dt = temperature change = 10 [K]
m = mass = 0.5 [kg]
Q = heat = 1985 [J]
Cp = specific heat [J/kg*K]
Now replacing:
[tex]1985=0.5*C_{p}*10\\C_{p}=\frac{1985}{0.5*10}\\C_{p}=397[\frac{J}{kg*K} ][/tex]
In a balanced equation, the total number of atoms of each element on the reactant side is _ total number of atoms on the product side
Explanation:
In a balanced equation, the total number of atoms of each element on the reactant side is equal total number of atoms on the product side
Define What is
Newton's third law of
motion?
Answer:
I had that on 6th grade here u go
His third law states that for every action in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A. Notice that the forces are exerted on different objects.
In Eric's planning to take photos of the Plato Crater, Copernicus Crater and Rupes Cauchy Crater, he is trying to
figure out if the craters are always facing the earth. He knows that the moon spins on its axis. Doesn't that mean the
craters will be facing away from the earth at some point in the moon/lunar cycle as the moon orbits the earth?
Are the carters always facing the earth as the moon orbits the earth?
Please help!!!
Answer:
Yes, the carters are always facing the Earth as the moon orbits.
Explanation:
T-Joe (65 kg) is running at 3 m/s. T-Brud (50 kg) is running at 4 m/s. What would be T-Joe's momentum?
Answer:
[tex]P_J=195N[/tex]
Explanation:
From the question we are told that
[tex]Mass\ of T-joe\ M_J=65\\Velocity\ of T-joe\ V_J=3m/s\\Mass of\ T-Brud\ M_B=50kg\\Velocity\ of T-Brud\ V_B=3m/s\\[/tex]
Generally the equation for momentum is mathematically given by
[tex]P=mv[/tex]
Therefore
T-Joe momentum [tex]P_J[/tex]
[tex]P_J=65*3[/tex]
[tex]P_J=195N[/tex]
A 900 kg vehicle moves around a curve with an incline of 20\circ∘ at a speed of 12.5 m/s. If the curve has a radius of 50 meters, what normal force [N] will the vehicle experience?
IN NEWTONS
Answer:
The normal force experienced by the car is approximately 8223.2 N
Explanation:
The question relates to banking of road where the centripetal force for the circular motion of the vehicle is provided by the horizontal component of the normal reaction
The mass of the vehicle that moves around the curve, m = 900 kg
The incline of the curve, θ = 20°
The speed with which the vehicle moves around the curve, v = 12.5 m/s
The radius of the curve, R = 50 meters
We have;
[tex]N \cdot sin(\theta) = \dfrac{m \cdot v^2}{R}[/tex]
Where;
θ = The angle of inclination of the road = 20°
N = The normal force experienced by the car
m = The mass of the car = 900 kg
v = The velocity with which the car is moving = 12.5 m/s
R = The radius of the curve around which the vehicle moves = 50 m
[tex]\therefore N = \dfrac{m \cdot v^2}{R \cdot sin(\theta)} = \dfrac{900 \times (12.5)^2}{50 \times sin(20^{\circ})} = 8223.1998754586828969046217875927[/tex]
The normal force experienced by the car = N ≈ 8223.2 N.
A 195 g glider is moving at 5.3 m/s on a frictionless air track. It then collides with a stationary 295 g glider.
What would be the velocity after the collision of the gliders if the collision was inelastic? (2.11 m/s)
Answer:For a perfectly elastic collision, the final velocities of the carts will each be 1/2 the velocity of the initial velocity of the moving cart. For a perfectly inelastic collision, the final velocity of the cart system will be 1/2 the initial velocity of the moving cart.
Explanation:
You have a bottle of 1.7 Liters of happy water but no scale . Calculate the mass of the water. show units. "happy water" has a density of 1.1 g/cm^3
Im just putting questions from my friends quiz on here to see if u guys know
Answer:
1kg/ L
Explanation:
PLEASE HELP WITH GIVE BRAINLIEST!!! ❤️
Think about a book resting on a table. The weight of the book pushes down on the table with a force of 2 N. How much force does the table put on the book?
An unknown substance was observed to have the following properties: colorless liquid that feels slippery, pH of 8.5, turns red litmus to blue. Based on these properties, what is the best classification of this substance?
acid
base
element
salt
Answer:
It is a base
Explanation:
Because
Answer:it’s a base
Explanation: this is because the bases have a very bitter taste but a very slippery feel at the same time leading to a substance with a ph of 8.5 and the red turning to blue so this is a base
How does the Doppler effect cause a siren's pitch to increase as it
approaches you?
A. Sound waves are spread out, increasing wavelength and
decreasing frequency.
B. Sound waves are pushed closer together, increasing wavelength
and decreasing frequency.
C. Sound waves are spread out, decreasing wavelength and
increasing frequency.
D. Sound waves are pushed closer together, decreasing wavelength
and increasing frequency.
When a car sounds its horn as it approaches and moves away from an observer, there is a change in pitch known as a Doppler shift. During the approach, the received frequency is higher than the emitted frequency. ]Thus, option B is correct.
What Doppler effect cause a siren's pitch to increase?You hear a fairly high-pitched sound, like an ambulance coming at you with sirens blazing. This is because the moving ambulance is squishing the sound waves in front of the car together.
A good illustration of the Doppler effect is this. Since the effective wavelength is reduced due to an approaching source moving closer throughout the sound wave's period while the wave's velocity remains constant, the pitch is increased. Similar to this, a sound source that is fading away will have a lower pitch.
Therefore, Sound waves are pushed closer together, increasing wavelength and decreasing frequency.
Learn more about Doppler effect here:
Answer:B
Explanation:
PLS ANSWER WITH EXPLANATION OR SOLUTION (WILL GIVE 50 PTS)
An aircraft carries a static charge of 0.75 C. It travels at 235 m/s perpendicular to a
1.9
×
10
−
4
T magnetic field. What magnetic force does an aircraft experience?
Answer:
[tex] \underline{ \boxed{F_m = 3.35 { \times 10}^{ - 2} N}}[/tex]
Explanation:
[tex]since \: in \: this \: case \to \: \underline{ v }\: is \perp \: to \:\underline{ q} \\ then \: the \: magnetic \: force \: (F_m) \: is \: max = qvB \sin(90) \\ F_m = qvB \times (1) = qvB \\ hence \to \\ F_m = qvB \\ where \\ \: q = 0.75 C : v = 235m {s}^{ - 1} : B = 1.9 { \times 10}^{ - 4} T \\ therefore \to \\ F_m = 0.75 \times 235 \times 1.9 { \times 10}^{ - 4} \\ F_m = 176.25 \times 1.9 { \times 10}^{ - 4} \\ F_m = 0.0334875 = 3.35 { \times 10}^{ - 2} N \\ \boxed{F_m = 3.35 { \times 10}^{ - 2} N}[/tex]
How can being near a large body of water affect the climate of a region? PLZ help me!!!
There would be more hurricanes because hurricanes from by water.
More rain because you would get more precipitation.
Higher flooding if a storm comes through.
If you act without reason or sound judgement, people will describe you as __________.
a
impressionable
b
irrational
c
inconsistent
d
inconsiderate
Answer:
irrational
Explanation:
Will MARK BRAINLIST a only for correct answer
I need help ASAP
Thanks + BRAINLIST
Which of the following is true for sound waves?
-They require a medium
-They are unrelated to vibrations.
-They can travel in a vacuum
-They cannot travel through liquids
-None of the above
Answer:
Explanation:
They require a medium.
If you found my answer useful then please mark me brainliest.
Answer:
- They require a medium
Explanation:
Sound waves are, by definition, waves of vibrating matter. You need a medium like a solid, liquid or gas to transmit sound waves. A vacuum is space without matter, and so sound cannot be transmitted through it. Outer space is, for the most part, a vacuum, so that line from Alien rings pretty true:
"In space, no one can hear you scream."
Karen bought 99100 kids and fuced 4 of them how many of them have white stuffin there
body know
Answer:
all
Explanation:
i was in a question kinda like this and I think it's all
How many grams of sugar are in 0.5mol C6H12O6?
Answer:
90.07794 grams
Explanation:
Juan amd kym have four samples of matter. They are observing and describing the properties of these samples. Which property will beat provide evidence that the samples are solids rather than liquids?
Answer: The property that will best provide evidence that the samples are solid includes:
--> if the substance has a definite shape,
-->if the substance has a definite volume
--> if it's tightly packed.
Explanation:
According to the kinetic theory of matter, every substance consist of very large number of very small particles called molecules. These molecules, which are made up of atoms that are the smallest particles of a substance that can exist in a free state.
Matter can exist in the following states:
--> Solid state
--> liquid state or
--> Gaseous state.
The general property of a substance that is in gaseous state includes:
--> Definite shape: A substance can be grouped as a solid if it's shape is fixed that is, it doesn't depend on the shape of other materials.
--> Definite volume: A substance can be grouped as a solid if it occupies its own shape. This is due to the force of cohesion among its molecules.
--> Tightly packed: A substance can be grouped as solid if the molecular movements of the particles are negligible.
From the samples under observation by Juan and kym, if the sample that possesses the above described qualities, it is a solid rather than liquid or gas.
If you climb two sets of stairs each with a height of 4 meters how much work will you do compared to climbing just one set of stairs that is 4 meters
Answer:
You will do twice the work of climbing 1 stair.
Explanation:
To obtain the answer to the question, we shall determine the work done on each case. This is illustrated below:
Case 1 ( climbing 2 stairs):
Mass (m) = m
One stair = 4 m
Height (h) = 2 × 4 = 8 m
Acceleration due to gravity (g) = 10 m/s²
Workdone 1 (Wd₁) =?
Wd₁ = mgh
Wd₁ = m × 10 × 8
Wd₁ = 80 × m
Case 2 (Climbing 1 stair)
Mass (m) = m
Height (h) = 4 m
Acceleration due to gravity (g) = 10 m/s²
Workdone 2 (Wd₂) =?
Wd₂ = mgh
Wd₂ = m × 10 × 4
Wd₂ = 40 × m
Now comparing the Workdone in both case:
Workdone 1 (Wd₁) = 80 × m
Workdone 2 (Wd₂) = 40 × m
Wd₁ / Wd₂ = 80 × m / 40 × m
Wd₁ / Wd₂ = 2
Cross multiply
Wd₁ = 2 × Wd₂
Thus, we can see that the Workdone in climbing 2 stairs is twice the Workdone in climbing 1 stair.
Therefore, you will do twice the work of climbing 1 stair.
. A car with a mass of 700-kg changes its speed from 10.0 m/s to 30.0 m/s in a displacement of 50.0 meters. Calculate the net force acting on the car during this time.
Answer:
5600N
Explanation:
Given parameters:
Mass of car = 700kg
Initial velocity = 10m/s
Final velocity = 30m/s
Displacement = 50m
Unknown:
Net force acting on the car = ?
Solution:
To find the force acting on a body, it is pertinent we know the mass and acceleration.
Force = mass x acceleration
Now;
Let us find the acceleration from the kinematics equations:
v² = u² + 2aS
v is the final velocity
u is the initial velocity
a is the acceleration
S is the distance
30² = 10² + (2 x a x 50)
900 = 100 + 100a
100a = 800
a = 8m/s²
Therefore;
Force = 700 x 8 = 5600N
An example of a unicellular organism includes all of the following except what?
Answer:
Amoeba, paramecium, euglena are the examples of unicellular organism
Explanation:
Hope you like my answer
Which two figures are used to
determine the average speed?
difference between MKS system and CGS system
Answer:
MKS stands for Meter, Kilogram and second. In this system of unit mass is given in Kilogram, length in meter and time in second. ... CGS system stands for Centimeter- Gram- Second system. In CGS system, length is measured in centimeters mass is measured in grams and time is in seconds.
Please help
What is the magnitude of the normal force on the bag?
Answer in units of N.
Answer:
41.576 N
Explanation:
Resolving force in the inclined plane in the x and y directions gives us;
F_x = mg sin θ
F_y = mg cos θ
Thus;
F_x = 4.8 × 9.81 × sin 28
F_x = 22.106 N
F_y = 4.8 × 9.81 × cos 28
F_y = 41.576 N
We can use Newton's second law to find the normal force.. Thus;
N - F_y = 0.
Where N is normal force;
N = 41.576 N
Label the parts of this transverse wave,
A
B
C
What are the two most abundant elements in a main
sequence star?
A) carbon and hydrogen
B) hydrogen and helium
C) helium and carbon
D) carbon and heavy metals
Answer:
B
Explanation:
The two most abundant elements in a main sequence star are the hydrogen and helium. Thus, the correct option is B.
What is the main Sequence star?The main sequence is a continuous and distinctive band of the stars which appears on the plots of stellar color versus the brightness. These color-magnitude plots are known as the Hertzsprung–Russell diagrams, named after their co-developers, Ejnar Hertzsprung and Henry Norris Russell. The stars on this band are known as the main-sequence stars or the dwarf stars. These are the most numerous true stars present in the universe and include the Sun.
Hydrogen is the most abundant element which is possessed by the main sequence star. After hydrogen atom, the most abundant element which is found is helium. This gets accumulated in the star's core through the process of nuclear fusion.
Therefore, the correct option is B.
Learn more about Sequence star here:
https://brainly.com/question/30369795
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in witch situation is work being done?
theres a photo added.
