Work needed = 23,520 J
Further explanationGiven
height = 12 m
mass = 200 kg
Required
work needed by the crane
Solution
Work is the transfer of energy caused by the force acting on a moving object
Work is the product of force with the displacement of objects.
Can be formulated
W = F x d
W = Work, J, Nm
F = Force, N
d = distance, m
F = m x g
Input the value :
W = mgd
W = 200 kg x 9.8 m/s²x12 m
W = 23520 J
Rhyolite forms as lava cools very quickly, forming holes.
Sometimes gems can form within the holes. The image
shows fire opal within rhyolite.
Which type of rock is rhyolite?
A. Intrusive igneous
B. Extrusive igneous
C. Metamorphic
D. Sedimentary
PREVIOUS
Answer:
B. Extrusive igneous
Explanation:
Its B
Which compound contains only covalent bonds CH3OH Ca(OH)2 Ba(OH)2 NaOH
Answer: CH3OH
Explanation:
How much power is developed in a car that can pull a 5000 N at a constant speed
of 20 m/s?
Answer:
YAYA MAN
Explanation:
What are the important points to remember while constructing an electric
circuit?
Explanation:
There are four fundamental elements of an electrical circuit, irrespective of where or even how positive or negative it is: a power source, a resistor, an electric generator or unit, and at most one regulator or switch.
According to the article, why might acting happy actually make one happy?
Answer: mirror neurons are the reason people usually reflect the behavior of those around them and have been linked to the ability to empathize. People are attracted to happy people because it seems to boost our mood.
Explanation:
Answer:
Some psychologists think that you can trick your brain into feeling happy by acting happy. Acting happy might actually make one happy by mirror neurons. This is the reason people usually reflect the behavior of those around them and have been linked to the ability to empathize. People are attracted to happy people because it seems to boost our mood. The three components of emotion are cognitive, physiological, and behavioral. There is actually some scientific evidence to suggest that smiling, even when you are not feeling happy, can make you happy. This idea is called the facial feedback hypothesis. Happiness, and smiling, can also be contagious and make others around them want to smile. People often mimic the facial expressions of others.
Explanation:
100% on Edge 2023!! You're welcome :) :) :) :)
If 59.1 g of pure metal uses 890.9 j of energy to heat it from 26.1 c to 59.6 c, identify the metal
Answer: The metal is iron.
Explanation:
We have 59.1 grams of a given metal.
We need 890.9 joules of energy to heat the metal from 26.1°C to 59.6°C
First, we need to see the net increase in temperature, which is equal to the difference between the final temperature and the initial temperature.
ΔT = 59.6°C - 26.1°C = 33.5°C
Now we can find the specific heat, which is calculated as:
c = Ε/(ΔT*m)
Where:
E = energy given to the material = 890.9 J
m = mass of the material = 59.1 gr
ΔT = change in temperature = 33.5°C
Replacing these in the above equation we get:
c = 890.9 J/(33.5°C*59.1 gr) = 0.45 J/(gr*°C)
Now we need to look at a table of specific heats and see which metal has this specific heat.
We can see that iron is the best match, so we can assume that the metal is iron.
Which statement best compares a scientific theory and an opinion?
O A. Neither an opinion nor a scientific theory can ever be changed.
O B. An opinion is supported by evidence, while a scientific theory often is not supported by evidence.
OC. A scientific theory is supported by evidence, while an opinion often is not supported by evidence.
OD A scientific theory can never be changed, while an opinion can change in many ways.
Im
Answer: c opinion is something ppl just suggest but a theory needs proof before it is confirmed
A man pushes against a tree with a force of 10 newtons (N). The tree does not move. What is the amount of force exerted
by the tree on the man?
ON
BSN
10 N
20 N
Answer:
10 N
Explanation:
Given that,
A man pushes against a tree with a force of 10 newtons.
We need to find the amount of force exerted by the tree on the man.
The force exerted by the tree on the man will be equal to the force that the man exert on the tree as per Newton's third law of motion.
It means the tree exert 10 N force on the man. Hence, the correct option is (c) i.e. 10 N.
A weight of 4.0 N is used to extend a spring. The extension of the spring is 0.06 m. (i) Calculate the spring constant, k, of the spring.
(ii) State what measurements should be made to determine the extension of the spring produced by the 4.0 N weight.
Answer:
See explanation
Explanation:
Hookes law states that; the displacement due to a stretching force is directly proportional to the magnitude of the deforming force.
F = ke
F = deforming force
k = force constant
e = extention
k = F/e
k = 4N/0.06 m= 66.67 Nm^-1
To determine the extension of the spring produced by the 4.0 N weight
1) We measure the original length of the spring
2) We measure the length after hanging the 4 N mass
3) Subtract the new length from the original length to determine the extention.
A shopping cart with two nice kids, rolls off a horizontal roof ledge that is 50
meters high. The cart and nice kids land 30 meters from the base of the ledge.
How fast was the cart rolling when it left the ledge?
Answer:
9.39 m/s
Explanation:
Using the y-direction, we can solve for the time t it takes for the cart to reach the ground.
Assume the up direction is positive and the down direction is negative.
v₀ = 0 m/sa = -9.8 m/s² Δy = -50 m t = ?Find the constant acceleration equation that contains these four variables.
Δy = v₀t + 1/2at²Substitute known values into this equation.
-50 = (0)t + 1/2(-9.8)t²Multiply and simplify.
-50 = -4.9t²Divide both sides of the equation by -4.9.
10.20408163 = t²Square root both sides of the equation.
t = 3.194382825Now we can use this time t and solve for v₀ in the x-direction. Time is most often our link between vertical and horizontal components of projectile motion.
List out known variables in the x-direction.
v₀ = ?t = 3.194382825 s a = 0 m/s²Δx = 30 mFind the constant acceleration equation that contains these four variables.
Δx = v₀t + 1/2at²Substitute known values into the equation.
30 = (v₀ · 3.194382825) + 1/2(0)(3.194382825)²Multiply and simplify.
30 = v₀ · 3.194382825Divide both sides of the equation by 3.194382825.
v₀ = 9.391485505The cart was rolling at a velocity of 9.39 m/s (initial velocity) when it left the ledge.
Answer:
9.39 m/s
Explanation:
Using the y-direction, we can solve for the time t it takes for the cart to reach the ground.
Assume the up direction is positive and the down direction is negative.
v₀ = 0 m/s
a = -9.8 m/s²
Δy = -50 m
t = ?
Find the constant acceleration equation that contains these four variables.
Δy = v₀t + 1/2at²
Substitute known values into this equation.
-50 = (0)t + 1/2(-9.8)t²
Multiply and simplify.
-50 = -4.9t²
Divide both sides of the equation by -4.9.
10.20408163 = t²
Square root both sides of the equation.
t = 3.194382825
Now we can use this time t and solve for v₀ in the x-direction. Time is most often our link between vertical and horizontal components of projectile motion.
List out known variables in the x-direction.
v₀ = ?
t = 3.194382825 s
a = 0 m/s²
Δx = 30 m
Find the constant acceleration equation that contains these four variables.
Δx = v₀t + 1/2at²
Substitute known values into the equation.
30 = (v₀ · 3.194382825) + 1/2(0)(3.194382825)²
Multiply and simplify.
30 = v₀ · 3.194382825
Divide both sides of the equation by 3.194382825.
v₀ = 9.391485505
The cart was rolling at a velocity of 9.39 m/s (initial velocity) when it left the ledge.
PLS, THIS IS URGENT!! Read the following passage that explains the image you examined at the beginning of the lesson in order to answer the following question. Why is it important to have a range of tools that can measure all parts of the electromagnetic spectrum?
I would give the BRAINLIEST for the best answers!!!
Answer:
It is important to have a range of tools that can measure all parts of the electromagnetic spectrum because electromagnetic spectrum have different radiations such as infrared, visible light, ultraviolet, radio waves, microwaves, X-rays and gamma rays. Each of these radiation requires different instrument for their measurement. So that's why a range of tools are needed to measure electromagnetic spectrum.
Shine the flashlight on the liquid crystal sheet. Did you observe evidence that light carries energy?
Answer:
no i did not observe anything
Explanation:
A bicycle is 10 m from a wall traveling at a rate of 4 m/s. How far from the wall will it be if it accelerates at a rate of 12 (m/s)/s for 8 seconds
The bicycle is a distance x away from the wall at time t according to
x = 10 m + (4 m/s) t + 1/2 (12 m/s²) t ²
so that after t = 8 s, it will be
x = 10 m + (4 m/s) (8 s) + 1/2 (12 m/s²) (8 s)² = 426 m
away from the wall.
this is the measured value (always positive) from one point to another
Answer:
Distance.
Explanation:
Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point i.e the amount of distance covered by the physical object.
This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.
Mathematically, the motion of an object is described in terms of acceleration, time, distance, speed, velocity, displacement, position, etc.
Hence, distance is the measured value (always positive) from one point to another.
Mathematically, distance is given by the formula;
Distance = speed * time
Also, the S.I unit for measuring the distance covered by a physical object is meters.
PLS ANSWER FAST WILL GIVE BRAINLEST !!!
Calculate the missing variables using the necessary formula and rules using "FORCE"
How much force is needed to accelerate a 2000 kg car by 3 m/ s2
Answer:
F = 6,000 N
Explanation:
F = m × a
F = 2,000 × 3
F = 6,000 kg m/s²
F = 6,000 N
Suppose you bake a potato in a toaster oven that uses 1.2 kW. The oven is turned on for 25 minutes. How many kilowatt hours did it use?
Answer:
0.3kilowatts hours
Explanation:
If you bake a potato in a toaster oven that uses 1.2 kW and oven turned on for 25minutes, to get the amount in kilowatt hour, we will need to convert minutes to hour first
60minutes = 1hr
25minutes = x
60x = 25
x = 25/60 hr
x =
Multiply the time in hr with the power
Amount of kWhr used = 1.2 * 25/60
Amount of kWhr used = 30/60
Amount of kWhr used = 0.3kilowatts hours
Hence it used 0.3kilowatts hours
Question 8 of 10
When you see your reflection in a flat (plane) mirror, what type of image are
you seeing?
A. Smaller
B. Virtual
C. Larger
D. Real
Answer:
virtual
Explanation:
because the light rays do not meet at the image position
the other options are definitely wrong because
characteristics of a plane mirror images are that,
it is the same size as the object
it is upright
Answer:
B - Virtual
Explanation:
(Conservation of Momentum)
Consider a 2,000 kg car traveling 10 m/s toward another car.After the two cars collide, they couple together and move along at 6 m/s. What is the mass of the second car?
Can someone please solve and explain,I don’t understand:/
Answer:
I haven't learnt physics at all yet but I'll try.
After the two cars collide, they move at 6 m/s.
This tells us that the 2nd car which collided with the first car which is 2000 kg is much heavier than the 1st one, if the second one was lighter, the two cars coupled together speed would be much more than just 6 m/s.
Refer to explanation for working.
Explanation:
Now find out how much g or kg is the 2nd car more than the 1st.
2000 ÷ 10 = 200 (I don't really know how to explain this part)
10 - 6 = 4 (Difference for 1st car average speed per second and the coupled cars average speed per second)
200 x 4 = 800
2000 + 800 = 2800 kg
(Final answer)
If too much energy is given to an electron that is above the threshold
frequency what happens to the extra energy?
Answer:
The electron gives up It's extra energy in a form called "photon light" and falls back down to its normal energy level
Explanation:
Which of the following is NOT a function of the skeletal system?
A. Support your body
B. Give shape to your body
C. Bring oxygen to your body
D. Protect your body
A jet play sits on the runway and then rapidly accelerates does it go to potential to kinetic energy?
Please hurry please
What is the height of the counter where a 4 kg fruit basket sits that has 30 J of gravitational potential energy? h= GPE/am
Answer:
0.765m
Explanation:
gravitational potential energy GPE = mass * acceleration due to gravity * height
Given
GPE = 30Joules
Mass m = 4kg
acceleration = 9.8m/s²
Required
Height h
From the formula
h = GPE/mg
h = 30/4(9.8)
h = 30/39.2
h = 0.765m\
Hence the height of the counter is 0.765m
Which part of the following graph shows the object going at the fastest speed?
Distance
5
4-
in km
2-
1-
A А
0
6 5 10 15 20 25 30 35 40 45
Time in minutes
O Ato B
B to C
C to D
A to B and C to D are going equal speeds
Answer:
more point plzzzzz... eeeeeeeee
A to B in the graph shows the object going at the fastest speed.
In a distance-time graph, the gradient of the line is equal to the speed of the object. The greater the gradient (and the steeper the line) the faster the object is moving.
What is speed ?"The rate of change of position of an object in any direction. Speed is measured as the ratio of distance to the time in which the distance was covered. Speed is a scalar quantity as it has only direction and no magnitude."
Know more about speed here
https://brainly.com/question/7359669?
#SPJ2
how can we prove an object is moving? a) Compare it to another object. b) Measure it's change in position. c) Identify it's location. d) There is no way to measure motion
Answer:
B
Explanation:
The object won't stay in the same place if its moving
Explanation:
B) Measure it's change in position.
Why does the time for 20 complete oscillations need to be taken in the pendulum oscillation experiment?
Answer:
In order to minimize the uncertainty in the period, we measured the time for the pendulum to make 20 oscillations, and divided that time by 20
Explanation:
A man pushed the box with a force of 20 N. He doubled his force to 40 N. The box did not
change. Which option best describes the acceleration of the box after the force was doubled?
a) Acceleration is 2x the original acceleration
b) Acceleration is 4x the original acceleration
c) Acceleration is 1/2x the original acceleration
d) Acceleration is 1/4x the original acceleration
Answer:
A
Explanation:
if the man doubles his force to 40 and the box was yet to move that means acceleration also doubled so your answer would be A
Enter a range of values for x.
a
a
3x-90 930
26
27
Answer:
32[tex]3x - 9 + 93 = 180 \\ 3x + 84 = 180 \\ 3x = 180 - 84 \\ = 96 \\ x = \frac{96}{3} \\ x = 32[/tex]
Answer:
the answer is 3 and 34 i just took the quiz
Someone is traveling from Houston, TX to Dallas, TX. It takes 4 hours to make the 224mile trip. What is his velocity?
3. If the net work done on an object is negative, then the object's kinetic energy
a. decreases.
b. remains the same.
c. increases.
d. is zero.
Answer:
I think the answer is B I hope this helps also Im sorry If I'm wrong
Do different types of electromagnetic waves travel at different speeds?
No.
Radio, TV, microwave, heat, red, yellow, blue, tanning rays, X-rays, and gamma rays all travel at the same speed. It's called the "speed of light".
(As long as they're all traveling through the same stuff.)