Long question good luck:)
How much power is required to lift a 2.00-kg object 5.00 meters in 4.50 seconds? (If there is a formula for this please, tell me what it is also it is about pulleys one of the simple machines)
Finding volume using displacement and calculating density
Answer:
a) 0.1
b) density = mass/volume
= 0.5 /0.1
= 5 kg/[tex]m^{3}[/tex]
The sum of two component vectors is referred to as the
vector.
Addition
Quantitative
Subtraction
Resultant
A resultant force of 4 N acts on a object of mass 0.50 kg for 3 seconds. What is the change in velocity caused by this force?
A- 4 m/s
B- 6 m/s
C- 12 m/s
D- 24 m/s
It’s D but why?
Answer:24
Explanation:
First you need to calculate the acceleration, for this use can use the following formula Force (F) = Mass (M) x Acceleration (A). If we extract A out of this, you can get the following equation A = F/M = 4/0.5 = 8 m/s^2. So, the object accelerates each second by 8 m/s, if the object does this for 3 second, the velocity would be 8 x 3 = 24
In which of the following instrument is the image that is formed erect
a. Pin hole camera b. Simple camera c. microscope d. periscope
Answer:
C. microscope
Explanation:
A simple microscope is magnifying glass, an ordinary double convex lens having a short focal length that produces virtual and erect image.
What are the ways of heat transfer?
Answer:
Conduction, Convection and Radiation
Explanation:
Hope this helps!
How to Calculate weight
Answer:
Weight is a measure of the force of gravity pulling down on an object. It depends on the object's mass and the acceleration due to gravity, which is 9.8 m/s2 on Earth. The formula for calculating weight is F = m × 9.8 m/s2, where F is the object's weight in Newtons (N) and m is the object's mass in kilograms.
Explanation:
A space shuttle travels around the Earth at a constant speed of 28000 kilometers per hour. If it takes 90 minutes to complete one orbit, how far is its journey around Earth?
Answer Quick plz!
Answer:
Explanation:
14
A battleship simultaneously fires two shells toward two identical enemy ships. One shell hits ship A, which is close by, and the other hits ship B, which is farther away. The two shells are fired at the same speed. Assume that air resistance is negligible and that the magnitude of the acceleration due to gravity is g.1. What shape is the trajectory (graph of y vs. x) of the shells?a. straight lineb. parabolac. hyperbolad. the shape cannot be determined.2. For two shells fired at the same speed which statement about the horizontal distance traveled is correct?A. The shell fired at a larger angle with respect to the horizontal lands farther away.B. The shell fired at an angle closest to 45 degrees lands farther away.C. The shell fired at a smaller angle with respect to the horizontal lands farther away.D. The lighter shell lands farther away.Now, consider for the remaining parts of the question below that both shells are fired at an angle greater than 45 degrees with respect to the horizontal. Remember that enemy ship A is closer than enemy ship B.3. Which shell is fired at the larger angle?A. AB. BC. Both shells are fired at the same angle.4. Which shell is launched with a greater vertical velocity, vy?
A. AB. BC. Both shells are launched with the same vertical velocity.5. Which shell is launched with a greater horizontal velocity, vx?A. AB. BC. Both shells are launched with the same horizontal velocity.6. Which shell reaches the greater maximum height?A. AB. BC. Both shells reach the same maximum height.7. Which shell has the longest travel time (time elapsed between being fired and hitting the enemy ship)?A. AB. BC. Both shells have the same travel time.
Answer:
1) the correct answer is B , 2) θ= 45º,
3) the projectile A must have a greater angle ,
4A) vₓ (B)> vₓ (A) ,
5B) The maximum height is reached by the projectile with the highest speed, from the front this is projectile B
7) if the vertical velocity of both projectiles is the same time is the same
therefore the two projectiles have equal flight times
Explanation:
In this long exercise you are asked to answer a series of questions about the launching of projectiles
1) Path type
since they indicate that the air resistance is negligible the horizontal displacement is
x = v₀ₓ t
On the vertical axis, a relationship acts, which is gravity, therefore its displacement is
y = [tex]v_{oy}[/tex] t - ½ g t²
let's substitute to eliminate time
y = v_{oy} (x / v₀ₓ) - ½ g (x / v₀ₓ)²
y = (tan θ) x - (g / v₀ₓ²) x²
we can see that this is the equation of a parabola
therefore the correct answer is B
2) From the missile launch expressions the range is
R = x = v₀² sin² 2θ / g
for the range to be maximum sin 2θ = 1, this occurs for
2θ = 90
θ= 45º
the correct answer is "The projectile fired at an angle close to 45º lands farther"
In response D implies that the projectile has been divided into two parts, in this case it is true that the lighter part must go further.
3) From the expression of scope we can see that as the angle increases the square sine becomes smaller, for example without 180 = 0
therefore to reach the nearest ship A must launch with a greater angle, therefore the projectile A must have a greater angle
Respect the questions are a bit strange.
* If the projectiles are fired at the same angle and in the statement they indicate that the velocities are equal, the two must reach the same height 4
4A. If the vertical speed is equal, the projectile that must reach the furthest ship (B) must have more horizontal speed
vₓ (B)> vₓ (A)
5B. Both are launched with the same horizontal speed.
which is higher
[tex]v_{y}[/tex]² = v_{oy}² - 2 g y
at maximum height vertical velocity is zero (v_{y} = 0)
0 = v_{oy}² - 2 g y
y = v_{oy}² / 2g
the maximum height is reached by the projectile with the highest speed, from the front this is projectile B
7) they both reach the same height
As the value of the acceleration due to gravity is constant, the time to go up is the same time to go down, therefore if the two projectiles reach the maximum height, the time used is
[tex]v_{y}[/tex] = v_{oy} - g t
0 = v_{oy} - gt
t = v_{oy} / g
if the vertical velocity of both projectiles is the same time is the same
therefore the two projectiles have equal flight times
What phrase would a Patriot who SUPPORTED independence from Britain agree
with?
A "No taxation without representation"
B "No war is worth its cost in life"
C "Loyalty to the British at all costs"
D "Let us not pay a price in blood but instead accept the dove of peace"
Use words from the box to complete the sentences below.
-direction
-energy
-mass
-size
Vectors have size and ___
Scalars have only ____
Answer:
direction
size
Explanation:
Vectors are physical quantities with both magnitude or size and direction.
Scalars are physical quantities with only size but not direction.
Examples of vectors are velocity, displacement and force. Examples of scalar are distance and speedWhen describing a vector, on must specify its magnitude and direction.
Only the size of scalar quantities are needed to describe them.
State the career function of chemical engineering
Answer:
Chemical engineers develop and design chemical manufacturing processes. They apply the principles of chemistry, biology, physics, and math to answer problems that involve the production of chemicals, fuel, drugs, food, and many products
Explanation:
Answer:
The main role of chemical engineers is to design and troubleshoot processes for the production of chemicals, fuels, foods, pharmaceuticals, and biologicals, just to name a few. They are most often employed by large-scale manufacturing plants to maximize productivity and product quality while minimizing costs
Explanation:
UWU plz help 50 points!!
A sprinter accelerates from the starting blocks with an acceleration of 2.5 m/s/s. They accelerate for a total of 8 seconds.
a. How far will they run while accelerating? Explain how you found your answer.
b. How fast are they moving after those 8 seconds? Explain how you found your answer
Answer:
i think its 20m for b
Explanation:
Which procedure would best demonstrate that moving magnet causes an electric current to flow in a wire coil?
Answer:
D
Explanation:
I took the test
The procedure that would best demonstrate that moving magnet causes an electric current to flow in a wire coil is connect a wire coil to an ammeter. Move a bar magnet into and out of the wire coil as you observe the ammeter. The correct option is D.
What is electric current?The flow of electricity in an electronic circuit, as well as the amount of electricity flowing through a circuit, are referred to as electric current. It is expressed in amperes (A).
The greater the value in amperes, the more electricity flows through the circuit.
When an electron is introduced into a wire, a free electron is attracted to a proton in order to be neutral.
Forcing electrons out of their orbits can result in an electron shortage. Electric current is the continuous movement of electrons in a wire.
Connecting a wire coil to an ammeter is the best way to demonstrate that a moving magnet causes an electric current to flow in a wire coil. As you watch the ammeter, move a bar magnet in and out of the wire coil.
Thus, the correct option is D.
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PLEASE HELP!! ITS URGENT!!!
Answer:
F = 800 [N]
Explanation:
To be able to calculate this problem we must use the principle of momentum before and after the impact of the hammer.
We must summarize that after the impact the hammer does not move, therefore its speed is zero. In this way, we can propose the following equation.
ΣPbefore = ΣPafter
[tex](m_{1}*v_{1}) - F*t = (m_{1}*v_{2})[/tex]
where:
m₁ = mass of the hammer = 0.15 [m/s]
v₁ = velocity of the hammer = 8 [m/s]
F = force [N] (units of Newtons)
t = time = 0.0015 [s]
v₂ = velocity of the hammer after the impact = 0
[tex](0.15*8)-(F*0.0015) = (0.15*0)\\F*0.0015 = 0.15*8\\F = 1.2/(0.0015)\\F = 800 [N][/tex]
Note: The force is taken as negative since it is exerted by the nail on the hammer and this force is directed in the opposite direction to the movement of the hammer.
a sheet of metal is 2mm wide 10cm tall and 15cm long. it was 4g. what is the density?
Answer:
Ro = 133 [kg/m³]
Explanation:
In order to solve this problem, we must apply the definition of density, which is defined as the relationship between mass and volume.
[tex]Ro = m/V[/tex]
where:
m = mass [kg]
V = volume [m³]
We will convert the units of length to meters and the mass to kilograms.
L = 15 [cm] = 0.15 [m]
t = 2 [mm] = 0.002 [m]
w = 10 [cm] = 0.1 [m]
Now we can find the volume.
[tex]V = 0.15*0.002*0.1\\V = 0.00003 [m^{3} ][/tex]
And the mass m = 4 [gramm] = 0.004 [kg]
[tex]Ro = 0.004/0.00003\\Ro = 133 [kg/m^{3}][/tex]
Randy has 2 cats. The male is solid black. The female is white. The cats have 6 kittens. All the kittens are black.
What does this tell Randy?
A. Black fur color may be a dominant trait.
Ooo
B. Fur color is passed on by one parent.
C. Fur color is random in cats.
D. The color of the parents does not affect the kittens.
E. Kitten fur color changes.
Here, the black color may be dominant trait in the kittens and trait for white color is hidden in the kittens.
What are genetic traits ?The genetic codes that creates a particular characteristics in a species is called a gene trait. Most of common characteristics will be inherited from the parents to the offsprings.
The B gene regulates the synthesis of eumelanin, the pigment that gives cats their black fur. It has three different alleles, or kinds. It just takes one B allele from one parent for a cat to have black fur since the B gene, which causes black fur, is dominant.
Either parent's color or a mixed color is getting for the kittens. Sometimes the one color trait will be hidden in them and in that case they show the color one parent that is dominant.
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define the unit of time and unit of length
Answer:
hope you like
Explanation:
A unit of time is any particular time interval, used as a standard way of measuring or expressing duration.Its SI unit is second
A unit of length refers to any arbitrarily chosen and accepted reference standard for measurement of length. Its SI unit is meter
Albert Bandura’s theory, originally called social learning theory, is now referred to as __________, and it suggests cognitive processes play a role in influencing one’s personality.
Answer:
social cognitive theory
Explanation:
Albert Bandura's theory, originally called social learning theory, is now referred to as social cognitive theory, and it suggests cognitive processes play a role in influencing one's personality.
Albert Bandura's theory, originally called social learning theory, is now referred to as social cognitive theory, and it suggests cognitive processes play a role in influencing one's personality.
What are cognitive processes?Cognitive processes refer to the mental processes involved in perception, attention, memory, reasoning, problem-solving, and decision-making. They involve the use of knowledge, experience, and understanding to process information and make sense of the world around us.
Here, examples of cognitive processes include perception, attention, memory, language processing, and executive functions such as planning and decision-making. Cognitive processes are essential for learning, problem-solving, and adaptive behavior, and they are an important focus of study in psychology and cognitive science.
Albert Bandura's theory, originally called social learning theory, is now referred to as social cognitive theory, and it suggests cognitive processes play a role in influencing one's personality.
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An ice skater spins with an angular speed 2w with an angular speed
A student is building a model of a parallel circuit consisting of a battery, a switch, five light bulbs, and wires. When she connects all of the
components of her model, none of the bulbs light up. Which of the following could be the problem with her model? (AKS 10b / DOK 2)
1
2
3
4
One of the bulbs is burnt
out
One or more of the wires is not connected to the battery
The switch isn't properly closed
The resistance of the light bulbs prevents current from flowing through the circuit
O A 1, 2, and 4
OB 1, 2, and 3
OC. 1, 3, and 4
OD. 2, 3, and 4
Answer:
(D) 2, 3, and 4
Explanation:
Given that the connection is parallel,
The parallel circuit consisting of a battery, a switch, wires, and 5 bulbs has been shown in the figure.
But none of the bulbs light up upon completing the connection.
The given possible reasons are:
Option (1): One of the bulbs is burnt out.As the connection is parallel, so the current from the battery is divided to all 5 bulbs, is one bulb is burnt out, it will not stop the current flowing through the other bulbs, so this is not the possible reason.
Option (2): One or more of the wires is not connected to the battery.If one or more wire is not connected to the battery, then there will be no current in the circuit, so, no bulb will glow. Hence this may be the possible reason.
Option (3): The switch isn't properly closed.If the switch isn't properly closed, then the circuit is not closed. Then there will be no current in the circuit, so, no bulb will glow. Hence this may be the possible reason.
Option (4): The resistance of the light bulbs prevents current from flowing through the circuit.If the resistance of the bulb is very large and the current flowing in it is too less, then there will not be sufficient to glow the bulb. so, no bulb will glow. Hence this may be the possible reason.
So, the possible may be options (2), (3), and (4).
Hence, option (D) is correct.
What does the big ‘2’ in 2CO2 mean?
Please help quickly i'm in science class
Answer:
It means you multiply everything after the "Big two"
Explanation:
If Judy walks 2 blocks north, 5 blocks west, and then 2 blocks south, what is her final
displacement?
Answer: 2 blocks east if i'm not mistaken.
An egg is thrown horizontally off the top row bleachers at the Brickyard,
which is 30 meters high, with a horizontal velocity of 7.5 m/s. How long
does it take to hit the ground?
Answer:
4
Explanation:
Divide 30 meters by 7.5 and you´re answer is 4. This is how I would think you solve the problem
5. A helicopter scoops a load of water out of a lake, to dump on a forest fire. The helicopter exerts 6480
N of force on the water while rising high enough to fly over a mountain. If the helicopter does 1.62 x
10%) of work on the water while lifting it, how high does it lift the water.
Answer:
h = 250 m
Explanation:
Given that,
The helicopter exerts 6480 N of force on the water while rising high enough to fly over a mountain.
The helicopter does [tex]1.62\times 10^6\ J[/tex] of work on the water lifting it.
We need to find how high does it lift the water. Work done is given by :
[tex]W=Fh\\\\h=\dfrac{W}{F}\\\\h=\dfrac{1.62\times 10^6}{6480}\\\\h=250\ m[/tex]
So, it can lift the water to a height of 250 m.
3
A comb is charged negatively when coming a dry hair
is there a tranfer of charge alone or mass also
Answer:
there is transfer of change alone
Answer:
someone pls explain this question
If you maintain a constant force on an object what happens to the acceleration? What happens to the
velocity?
Answer:
Because you have no force, the acceleration is zero and the body moves at a constant speed
I will give 14 points & make you the brainiest
Terrestrial planets are primarily composed of what two materials?
a. hydrogen and helium
b. silicate rocks and metals
c. frozen water and methane
d. helium and iron
Answer:
B. silicate rocks and metals
Terrestrial planets, such as Earth, are primarily composed of silicate rocks and metals. The correct answer is b. silicate rocks and metals.
Silicate rocks, which are made up of silicon and oxygen, are the dominant building blocks of these planets. They include minerals like quartz, feldspar, and mica. Terrestrial planets contain significant amounts of metals such as iron, nickel, and other heavy elements. These metals are found in the planet's core, providing structural strength and contributing to the planet's magnetic field.
This composition differentiates terrestrial planets from gas giants like Jupiter and Saturn, which are predominantly composed of hydrogen and helium. The combination of silicate rocks and metals forms the solid, rocky surfaces that characterize terrestrial planets.
Therefore, The correct answer is b. silicate rocks and metals.
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Earthquakes are essentially sound waves—called seismic waves—traveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called PP waves, is 8000 m/sm/s. Transverse waves, called SS waves, travel at a slower 4500 m/sm/s. A seismograph records the two waves from a distant earthquake. The SS wave arrives 2.0 minmin after the PP wave. Assume that the waves travel in straight lines, although actual seismic waves follow more complex routes.
Question
Earthquakes are essentially sound waves—called seismic waves—traveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called P waves, is 8000 m/s Transverse waves, called S waves, travel at a slower 4500 m/s. A seismograph records the two waves from a distant earthquake. The S wave arrives 2.0 min after the PP wave.How far away is the Earthquake. Assume that the waves travel in straight lines, although actual seismic waves follow more complex routes.
Answer:
The distance is [tex]d = 1.23 *10^{6} \ m[/tex]
Explanation:
From the question we are told that
The speed of longitudinal seismic wave is [tex]v_p = 8000 \ m/s[/tex]
The speed of Transverse seismic wave is [tex]v_s = 4500 \ m/s[/tex]
The time difference between the arrival of longitudinal seismic with respect to Transverse waves is [tex]\Delta t = 2.0\ min = 120\ seconds[/tex]
Generally the time difference between the arrival of longitudinal seismic with respect to Transverse waves is mathematically represented as
[tex]\Delta t = t_p - t_s[/tex]
=> [tex]\Delta t =\frac{d}{v_p} -\frac{d}{v_s}[/tex]
=> [tex]d = \frac{\Delta t}{ \frac{1}{v_p} - \frac{1}{v_s} }[/tex]
=> [tex]d = \frac{120 }{ \frac{1}{8000} - \frac{1}{4500} }[/tex]
=> [tex]d = 1.23 *10^{6} \ m[/tex]
why the gaps left between succesive rails on a railway tracks
Small gaps which function as expansion joints are deliberately left between the rail ends to allow for expansion of the rails in hot weather. ... Because of these small gaps, when trains pass over jointed tracks they make a "clickety-clack" sound.