What will be the velocity of a train if it covers the distance of 30m in 3 s?
Answer:
Soln:
d=30m
t=3s
now:
v=d/t
=30/3
=10
A rock is kicked horizontally off a dock into the bay 3
times with a higher initial velocity each time as shown to the right. Which of the following statements is true regarding
these scenarios? AND WHY?
(a) The rock takes the longest time to hit the water in
case 3
(b) The rock takes about the same time to hit the water
in each case
(c) The rock hits the water below with the highest speed
in case 1
(d) The rock hits the water with the same speed in each|
case
Student Answer(s):
Student Reasoning:
Answer:
The true statement is;
(b) The rock takes about the same time to hit the water in each case
Explanation:
The given information are;
The direction in which the rock is kicked = Horizontally
The number of different initial horizontal with which the rock as kicked = different horizontal velocity
The time taken for the rock to hit the water is given by the following equation for projectile motion;
y = y₀ + v₀× sin(θ₀)×t - 1/2×g×t²
Where;
θ = The angle the rock makes with the horizontal when it was kicked = 0
y = The height through which the rock drops
y₀ = The initial height of the rock
t = The time taken for the ball to hit the water
g = The acceleration due to gravity ≈ 9.81 m/s²
For the different speeds, v₁, v₂, and v₃, we have;
y = y₀ + v₁× sin(0)×t - 1/2×g×t² = y₀ - 1/2×g×t²
y = y₀ + v₂× sin(0)×t - 1/2×g×t² = y₀ - 1/2×g×t²
y = y₀ + v₃× sin(0)×t - 1/2×g×t² = y₀ - 1/2×g×t²
Therefore, the time it takes for the ball to hit the water is given as follows;
[tex]t = \sqrt{\dfrac{(y_0 - y) \times 2}{g} }[/tex]
Which is the same for each case
However, the speed, v, with which the rock hits the water is given by the following equation;
[tex]v = \sqrt{v_x^2 + v_y^2}[/tex]
[tex]v_y[/tex] = The vertical velocity = v₀ × sin(θ₀) - g×t = v₀ × sin(0) - g×t = -g×t
[tex]v_y[/tex] = -g×t
Therefore, [tex]v_y[/tex], is the same for all three times
While vₓ = v₁, v₂, and v₃, for each of the three times.
Therefore, [tex]v = \sqrt{v_x^2 + v_y^2}[/tex] the speed with which the rock hits the water is different for all three times.
A toyota prius can go from 0 m/s to 30 m/s in 15 s. What is its acceleration? Select one: O 15 m/s2 O 2 m/s2 450 m/s2 30 m/s2
Answer:
I think it is 2m/s2
Explanation:
Have a great day:)
What is the resultant of 5N force pointing north and 7N force pointing south? Do not forget to include the direction.
Answer:
It would be 2N pointing South.
Explanation:
Since the forces are going in opposite directions, you can subtract them. Which makes it 7N south minus 5N North. That is 2N pointing South. Because the force going south is greater, it is the direction the force will be going.
Which vector points in the direction of the centripetal acceleration of the plane
Answer:
d
Explanation:
How long does it take a dropped object to fall 45 meters?
Answer:
If we forget about drag for a second then any object will accelerate at 9.8 m/s/s. The distance traveled is (9.8 m/s)/2 * (x seconds)^2, so solving for 45 meters the no-air fall will take 3.06 seconds and reach 30 m/s or 108 kph or 67.1 mph
Explanation:
A racecar on a straight track, starting from rest*, steps on the
accelerates towards the finish line at 10.0 m/s^2. If the finish line is
500.0m away, how yong does it take the car to cross the finish line?"
A 5.08
B 10.05
C 20.05
D 50.0s
E 100.0
Use the drop-down menu to complete the statement.
Increasing the amount of current that flows through a wire________ the strength of an electromagnet.
Answer:
increases
Explanation:
edgu2020
Increasing the amount of current that flows through a wire increases the strength of an electromagnet.
What is an electromagnet?An electromagnet is a type of magnet that is created by running an electrical current through a coil of wire. Unlike permanent magnets, which have a fixed magnetic field that cannot be adjusted, the magnetic field of an electromagnet can be turned on and off or adjusted by controlling the amount of current flowing through the coil.
The strength of an electromagnet depends on several factors, including the number of coils in the wire, the amount of current flowing through the wire, and the type of core material used in the coil. Electromagnets are widely used in various applications, such as in electric motors, generators, relays, MRI machines, and particle accelerators.
One of the advantages of electromagnets is that their magnetic field can be easily controlled by adjusting the amount of current flowing through the wire. This makes them useful in applications where the magnetic field needs to be turned on and off, or where a variable magnetic field is required.
Another advantage of electromagnets is that they can be designed to be much stronger than permanent magnets. This is because the strength of an electromagnet is directly proportional to the amount of current flowing through the coil, which can be increased or decreased as needed.
Here in this question,
This happens because an electromagnet is created when an electric current flows through a wire, generating a magnetic field around the wire. The strength of the magnetic field depends on the amount of current flowing through the wire.
When more current flows through the wire, the magnetic field around the wire becomes stronger. This is because the magnetic field is directly proportional to the current flowing through the wire, as well as the number of loops of wire in the coil.
Therefore, increasing the current flowing through a wire in an electromagnet will increase the strength of the magnetic field, resulting in a stronger electromagnet.
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An atom of an element has 8 protons and 9 neutrons in it's nucleus. What is the name of the element?
Which contributions did Johannes Kepler make? Check all that apply.
He revived Aristotle’s model of the solar system.
He solved Ptolemy’s model by proving elliptical orbits.
He proved Galileo’s calculations were incorrect.
He determined that planets move faster when closer to the Sun.
He discovered laws of planetary motion.
Answer:
the answers are 2, 4, and 5.
Explanation:
Which is true about a surface wave? ANSWER FAST
A.It only has properties of transverse waves.
B.It only has properties of longitudinal waves.
C.It has properties of both transverse and longitudinal waves.
D.It does not have properties of either transverse or longitudinal waves.
Answer:
D
Explanation:
Answer:
The guy above me is wrong. The answer is actually...
(C.)
A dog with mass 14 kg has a kinetic energy of 135.5 J. What is the speed
of the dog?
A. 2.3 m/s
B. 5.1 m/s
C. 3.2 m/s
D. 4.4 m/s
Answer: D. 4.4 m/s
Explanation:
Answer:The correct answer is 4.4 m/s but I will warn you, A p e x counted it WRONG when I gave this answer.
Explanation:
Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle θ. A car can safely travel along the unbanked curve at a maximum speed v0 under conditions when the coefficient of static friction between the tires and the road is 0.563. The banked curve is frictionless, and the car can negotiate it at the same speed v0. Find the angle θ of the banked curve.
Answer:
θ = 29.38°
Explanation:
The centripetal force is given by the formula;
F_c = F_n(sin θ) = mv²/r
Now, the vertical component of the normal force is; F_n(cos θ)
Now, this vertical component is also expressed as; F_n(cos θ) = mg
Thus, the slope is;
F_n(sin θ)/F_n(cos θ) = (mv²/r)/mg
tan θ = v²/rg
v² = rg(tan θ)
The initial speed will be gotten from the relation;
(v_o)² = μ_s(gr)
Plugging rg(tan θ) for (v_o)², we have;
μ_s(gr) = rg(tan θ)
rg will cancel out to give;
μ_s = (tan θ)
Thus, θ = tan^(-1) μ_s
μ_s is coefficient of static friction given as 0.563
θ = tan^(-1) 0.563
θ = 29.38°
A baseball is thrown vertically downward from the top of a 155 m tower with an initial velocity of -25 m/s. How long will it take, until it reaches the ground?
Answer:
t = 2.55 s
Explanation:
Given that,
Height from which the baseball is thrown, h = 155 m
Initial velocity of the baseball, u = -25 m/s
We need to find the time taken by it to reach the ground. Let the time is t. Using equation of kinematics to find it as follows:
[tex]v=u+at\\\\t=\dfrac{v-u}{a}\\\\t=\dfrac{0-(-25)}{9.8}\\\\t=2.55\ s[/tex]
So, it will take 2.55 seconds to reach the ground.
The part of a flower which holds the egg cells is the:
ovary
style
stamen
anther
Answer:
Maybe pistil or ovary
pistil usually is located in the center of the flower and is made up of three parts: the stigma, style, and ovary
Answer:
A. Ovary
Explanation:
What is the measure of how much a material resists the formation of an electric field?
A. Permittivity
B. Dielectric
C. Capacitance
D. Resistance
Answer:
C. Capacitance
Explanation:
right on EDGE2021
How are velocity and speed related to each other?
Answer:
Velocity is measured by a change in position/time, so that makes it similar to speed. However, to fully clarify velocity, you need to include direction.
Explanation:
So you should have the right answer as selected in the picture.
Ahmet hits a baseball that has a mass of 0.14 kg and accelerates it to 600 m/s2. What is the force that was applied?
Answer:
F = 600N
Explanation:
F = m x a
F = Force
m = mass
a = acceleration
F = 0.14 x 600 = 84N
Which statements about energy are true?
1.Energy is found only in moving objects.
2.Energy is never created.
3.Energy can move matter.
4.Energy is the same as force.
5.Energy is never destroyed
Answer:
Energy is found only in moving objects : False
Energy is never created : True
Energy can move matter : True
Energy is the same as force : False
Energy is never destroyed : True
Explanation:
Plato
Energy can neither be created nor be destroyed. Energy is generated by both moving and stationary objects but in different forms. Energy can move matter. Hence, options 2, 3 and 5 are correct.
What is energy conservation ?According to the law of conservation of energy, energy can neither be created nor be destroyed. However, it can be transformed from one state to the other. For example electrical energy can be converted to light energy.
Energy is generated in both stationary and moving object. The energy for a particle gained by its motion is called its kinetic energy. The energy stored on an object at rest is called potential energy.
Energy can move matter as well. The energy used to displace an object is called work done on the object. The unit of energy and work done is joule. Therefore, options 2, 3 and 5 are correct.
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HELP WHIT PROJECT PLZZ FOR ALL MY POINTS!!!!!!!!!!! X^X
Answer:
maybe. inv me to slides and I'll try.
Explanation:
HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer
C. 0 N
F=ma=0.5(0)=0 N
Answer:
c
Explanation:
hope it helps
How long will it take a person walking at 2.1 m/s to travel 13 m?
Answer:
I gonna give you the number so but you need to round 6.19047619048
Explanation:
This is a speed formula so you would use the formula speed=distance/timeYou need to rearrange it to time=distance/speedSo you need to divide 13m by 2.1 m/s???whats the answers??
The answers is 30 miles per hour, the driver is speeding the car up, section-H, 12 minutes, section-D, and 65 miles per hour.
The distance between a scalar and a vector is that a vector quantity includes what
Answer:
magnitude and direction e.g acceleration,displacement
Which items are needed for a plant to become fertilized?
egg
pollen
embryo
seed
How are the layers of the Earth similar and different from one another?
Answer:
the innermost layer of the earth
Explanation:
the earth has an outer core liquid and an inner core solid they are not chemically distinct from each other but they are chemically distinct from the mantle the core is mainly composed of nickel and iron
Why do you think the electron of the hydrogen atom stays close to the proton in the atom’s nucleus?
Answer:
Electrons are retained by the electromagnetic force in the orbit around the nucleus since the nucleus is positively charged in the middle of the atom and absorbs the electrons charged negatively.
Hope this helps!
We have that for the Question "Why do you think the electron of the hydrogen atom stays close to the proton in the atom’s nucleus" it can be said that
Electron of the hydrogen atom stays close to the proton in the atom’s nucleus because hydrogen with a low proton and electron number its repulsion will be low
From the question we are told
Why do you think the electron of the hydrogen atom stays close to the proton in the atom’s nucleus?
Generally
The electrons are father away from the protons in the nucleus as atomic number increasesThis is because of the law of attraction where unlike charges reply
Therefore
For hydrogen with a low proton and electron number its repulsion will be low and Hence electron of the hydrogen atom stays close to the proton in the atom’s nucleus
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An airplane lands with an initial velocity of 60 m/s and then slows down at 1.5 m/s2 for 30 seconds. What is its final velocity?
a. 3 m/s
b. 15 m/s
c. 98 m/s
d. 105 m/s
Which circuit is a series circuit
Answer:
The answer is A
Explanation:
Answer:
it is A)
Explanation:
it has multiple circuits.
One-fourth of adults in the United States are not active at all.
true
false
Answer:
true 28%
Explanation:
;"/:;,*"# /hcrvuvf
Answer:
True - - - probably more than one-fourth aren't to be honest
Explanation: