Answer:
Assuming rightward is positive, the velocity is positive whenever the car is moving to the right, and the velocity is negative whenever the car is moving to the left. The acceleration points in the same direction as the velocity if the car is speeding up, and in the opposite direction if the car is slowing down.
Explanation:
When you move a magnet into a coil of wires, it induces a current in the wires. When you take the same magnet and move it in the opposite
direction through the coils, it still induces a current. What is differnet about the currents created in these situations?
Answer:
If in an area, the magnetic flux will change then the emf (Electromotive force) induced in the wire will induce current flow in it.
If we moved the magnet inside coil of wire then its change in flux is more compared to the outside moving magnet then the induced current is more in the magnet that moves inside coil of wire
Explanation:
How long will it take an airplane at rest that
accelerates uniformly at 2.5 m/s to reach a ground
velocity of 70 m/s that is required for takeoff
Answer:
28 seconds.
Explanation:
Apply the first equation of motion as;
v=u +at where;
v= final velocity of the plane = 70m/s
u=initial velocity of the plane= 0m/s -----it was at rest
a= acceleration uniform =2.5 m/s²
t= time required for takeoff = ?
Substitute values in the equation as;
v= u + at
70 = 0 + 2.5*t
70 = 2.5t
70/2.5 = 2.5/2.5t
28 = t
Time required for takeoff is 28 seconds.
Be specific when answering both of the following question. When will a balloon powered car have potential energy?
Answer: Explanation:
Balloons are elastic and store potential energy when they are filled with air. When the air is released, the potential energy is converted into the energy of motion, which is also known as kinetic energy. This is the energy you see when the car is propelled forward.
What is the smallest planet in our solar system?
Answer:
pluto.... even tho they dont consider it a planet but it's a dwarf planet
A man has a mass of 50 kg on earth and travels to another planet where the
acceleration due to gravity is 2.5 m/s2. What is the mass of this man on this other
planet?
Answer:
jo
Explanation:
kkk kkk
A distance of 2.5 meters separates two similar balls of mass 0.70 kg each. Calculate the force of gravity between the two balls.
Answer:
2
Explanation:
what would the acceleration of the car be ?
Explanation:
Here you go, hope this helps!
A bumblebee carries pollen from the male portion of a plant to the female portion of the same flower. Fertilization occurs. Which statement is true about this type of reproduction?
A.
It’s asexual, and the offspring are genetically identical to the parents
B.
It’s sexual, and the offspring are genetically identical to the parents.
C.
It’s asexual, and the offspring are genetically different from the parents.
D.
It’s sexual, and the offspring are genetically different from the parents.
Answer:
a
Explanation:
To see how deep a well is you drop a rock in. The rock hits the water 10 seconds later.
How deep is the well? Draw the velocity-time graph for this motion.
Answer:
490m
Explanation:
Given parameters:
Time taken = 10s
Unknown:
Depth of the well = ?
Solution:
To find the depth of the well, we apply the appropriate motion equation:
h = ut + [tex]\frac{1}{2}[/tex]gt²
h is the depth
u is the initial velocity
g is the acceleration due to gravity = 9.8m/s²
t is the time taken
Input the parameters and solve;
The ball was dropped from rest; u = 0
h = [tex]\frac{1}{2}[/tex]gt²
h = [tex]\frac{1}{2}[/tex] x 9.8 x 10² = 490m
Consider an uncharged, conducting hollow spherical shell. The electric field on the inside surface of the spherical shell is measured to be directed toward the inner shell wall and varies in magnitude over the spherical shell's inside surface. It is known that the only charge in the hollow cavity inside the spherical shell is a point charge with magnitude q. What is the sign of the charge q?
Answer:
The sign of charge q is negative.
Explanation:
This is because electric field lines usually emanate from positive charges and terminate at negative charges. The negative charge in the hollow cavity induces a positive charge on the inner shell wall of the hollow shell which in turn induces the negative charge q on the hollow spherical shell.
Since the induced electric charge on the inner wall is positive, the electric field lines from that charge terminates at the inner charge q. Since electric field lines terminate only at negative charges, q is negative.
3- The velocity-time graph below shows the motion of a
ball in free fall. What is the acceleration of the ball from
0.5 to 0.7 seconds? Show your work:
Answer:
The acceleration of the ball from 0.5 to 0.7 seconds is 10 m/s²
Explanation:
The data from the given velocity-time graph are as follows;
Velocity (meters per second) [tex]{}[/tex] Time (seconds)
0 [tex]{}[/tex] 0.4
0.5 [tex]{}[/tex] 0.45
1. [tex]{}[/tex] 0.5
1.5 [tex]{}[/tex] 0.55
2.2 [tex]{}[/tex] 0.6
2.5 [tex]{}[/tex] 0.65
3.0 [tex]{}[/tex] 0.7
3.5 [tex]{}[/tex] 0.75
4.0 [tex]{}[/tex] 0.8
4.5 [tex]{}[/tex] 0.85
Therefore, the average acceleration of the ball from 0.7 to 0.7 seconds is given as follows;
Acceleration = (Change in velocity)/(Related change in time)
Acceleration = (3.0 - 1)m/s/(0.7 - 0.5)s = 2/0.2 m/s² = 10 m/s²
The acceleration of the ball from 0.5 to 0.7 seconds = 10 m/s².
The number of protons and neutrons in an atom is that atom’s _____________ number.
HELP PLEASE
Answer:
The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.
Explanation:
Please mark as brainliest
Answer:
Explanation:
atomic mass
a soccer ball is kicked horizontally off a cliff with an initial speed of 8 m/s and lands 16 m from the base of the cliff What is the time of flight of the soccer ball?
The time of flight of the soccer ball is 2 seconds.
Given the following data:
Initial speed = 8 m/sDisplacement = 16 meters.To find the time of flight of the soccer ball;
Mathematically, the time of flight for a horizontal displacement is given by the formula;
[tex]Time \;of \;flight = \frac{Displacement}{Initial \; velocity}[/tex]
Substituting the values into the formula, we have;
[tex]Time \;of \;flight = \frac{16}{8}[/tex]
Time of flight = 2 seconds.
Therefore, the time of flight of the soccer ball is 2 seconds.
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How many Magnesium atoms are in 10MgCl2?
The person above me is an idiot
Answer:
The correct answer is 10
Explanation:
10 times the singular magnesium which means: 10 times 1
There are 10 magnesium atoms in 10 MgCl₂ as depicted in the chemical formula.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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A 250-n force is directed horizontally as shown to push a 29-kg box up an inclined plane at a constant speed. Determine the magnitude of the normal force
Answer:
246.38N
Explanation:
Check the complete question in the attached diagram
The normal force acting on the body on an inclined is equal to the weight of the object as shown;
Weight = Normal force = mgcosθ
m is the mass of the box = 29kg
g is the acceleration due to gravity = 9.81m/s²
θ is the angle of inclination = 30°
N = 29 * 9.81 * cos 30°
N = 284.49cos30°
N = 246.38N
Hence the magnitude of the normal force is 246.38N
Can you help me on this? it is a phyisical science question.
Answer:
Electron
Explanation:
A 20-kilogram mass is traveling with a velocity of 3 m/s. What is the object's kinetic energy?
solution
Given
mass= 20kg
velocity =3m/s
K.E=?
K.E= ½mv²
½×20×3²
½×20×9
½×180
90 J
An automobile manufacturer claims that its product will, starting from rest, travel
400 m in 9.0 s. What is the acceleration required to do this?
Answer:
Acceleration, a = 9.877m/s²
Explanation:
Given the following data;
Distance, d = 400m
Time, t = 9secs
Since it's starting from rest, initial velocity, u = 0
To solve for acceleration, we would use the second equation of motion;
[tex] S = ut + \frac {1}{2}at^{2}[/tex]
Substituting into the values into the equation;
[tex] 400 = 0(9) + \frac {1}{2}a(9)^{2}[/tex]
[tex] 400 = \frac {1}{2}a81[/tex]
Cross multiplying, we have;
[tex] 800 = a81[/tex]
[tex] a = \frac {800}{81}[/tex]
a = 9.877m/s²
Therefore, the automobile would have to accelerate at a constant rate of 9.877m/s²
8. Approximately how many hours a day are spent in school and doing homework?
A. 7 hours
B. 8.5 hours
C. 9 hours
D. 8 hours
Answer:
There would be 9 b/c there is so many hours of school and the homework depends on how old you are so i am pretty sure it is C.
Explanation:
i’m stuck on this problem, help is very appreciated!!
Explanation:
Use the equation F=m×a
F= 1500 N
M= 500kg
a= F/M
a= 1500÷ 500
a= 3m/s^2
Answer:
Explanation:
Force, f = 1500 N
Mass, m = 500 kg
Acceleration, a = ?
f = ma
a = f/m
= 1500 / 500 = 3m/s^2
Hope this helps
plz mark as brainliest!!!!!
PLEASE HELP, WILL MARK BRAINLIEST
What objects exert the attractive force of gravity?
(1 Point)
Anything that has mass
Only planets, moons and stars
Only the Earth and the Sun
Only objects the size of the Earth or larger.
Answer:
Anything that has mass.
Explanation:
Answer: Anything that has mass.
Explanation:
A bowling ball rolls 33\,\text m33m33, start text, m, end text with an average speed of 2.5\,\dfrac{\text m}{\text s}2.5 s m 2, point, 5, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction. How many seconds did the ball roll?
The ball rolled for 13.2 s
Further explanationSpeed is scalar and no direction
[tex]\tt avg~speed=\dfrac{total~distance}{elapsed~time}=\dfrac{\Delta x}{\Delta t}[/tex]
A bowling ball rolls 33 m, with average speed = 2.5 m/s
So elapsed time :
[tex]\tt t=\dfrac{33~m}{2.5`m/s}=13.2~s[/tex]
Answer:
13.2
Explanation:
A marble rolls horizontally off a table that is 0.8 m tall. If the marble lands 0.6 m from the base of the table,
what is the initial velocity of the marble?
Answer:
Explanation:
Time of fall be t
Considering downward fall
h = 1/2 g t²
.8 = .5 x 9.8 t²
t² = .16
t = .4 s
Marble lands at .6 m away from the base
If u be its horizontal initial velocity
u x .4 = .6
u = 1.5 m /s .
The initial velocity of the marble will be "1.5 m/s".
Speed and VelocityAccording to the question,
Height of table, h = 0.8 m
Marble lands = 0.6 m
Acceleration due to gravity, g = 9.8
Let,
The time of fall be "t".
We know the relation,
→ h = [tex]\frac{1}{2} gt^2[/tex]
By substituting the values, we get
0.8 = 0.5 × 9.8 t²
t² = 0.16
t = √0.16
= 0.4 s
hence,
The horizontal initial velocity will be:
→ u × 0.4 = 0.6
u = [tex]\frac{0.6}{0.4}[/tex]
= 1.5 m/s
Thus the answer above is appropriate.
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Students had two batteries and two different resistors. During four trials, they build four different circuits and plan to measure the circuit’s current in Amps according to the following table.
Trial Number
Voltage (V)
Resistance (Ω)
Current (A)
1
1.5
200
2
1.5
100
3
3.0
200
4
3.0
100
For which trial would the students measure the smallest current in the circuit?
Answer: C. Trial 3
Explanation:
Trial 1 and 2 equal 1.5, Trial 3 equals 1 and Trial 4 equals 3. Trial 3 is the smallest current .
The trial for which the students would measure the smallest current is the circuit is trial 2 and trial 3.
To know the trial which generates the smallest current, we need to determine the current in each trial.
Since current I = V/R where V = voltage and R = resistance.
For trial 1, V = 1.5 V and R = 200 Ω
So, I = 1.5 V/200 Ω
= 0.0075 A
= 7.5 mA
For trial 2, V = 1.5 V and R = 100 Ω
So, I = 1.5 V/100 Ω
= 0.015 A
= 15 mA
For trial 3, V = 3 V and R = 200 Ω
So, I = 3 V/200 Ω
= 0.015 A
= 15 mA
For trial 4, V = 3 V and R = 100 Ω
So, I = 3 V/100 Ω
= 0.03 A
= 3 mA
Trial 2 and trial 3 both produce a the smallest current of 15 mA.
So, the trial for which the students would measure the smallest current is the circuit is trial 2 and trial 3.
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If two cars are 5 m apart, and one car has a mass of 2,565 kg and the other
car has a mass of 4,264 kg, what is the gravitational force between the two
cars? Newton's law of gravitation is F gravity
Gm; m2 The gravitational
constant G is 6.67 x 10-11 Nm2/kg?.
A. 5.84 x 10-6N
B. 4.37 % 105 N.
C. 1.46 10-4N
D. 2.92 x 10-5 N
Gravitational force between two cars are 2.92 × 10 ⁻¹¹ Nm²/kg.
The universal force of attraction happened between two objects is called as gravitational force.
The mass of the two cars, m₁ = 2565 kg
m₂ = 4264 kg
r = 5m
G = 6.67 ₓ 10 ⁻11 Nm²/kg
How gravitational force can be calculated?
Definition of gravitational force: The force of attraction between any two bodies is directly proportional to the product of the masses and inversely proportional to the square of the distance between them.
F ∝ m₁ m₂ ÷ r²
where the force exerted between the two masses m₁ and m₂,
F = G (m₁ m₂) ÷ r²
where as, F - Gravitational force between two bodies,
G - Gravitational constant,
m₁ - mass of the first body,
m₂ - mass of the second body,
r² - square of the distance between two bodies.
F= 6.67 × 10⁻¹¹ Nm²/kg ( 2565 kg × 4264 kg) ÷ ( 5²)
Hence,
F = 2.92 × 10⁻⁵ N
Option D is correct answer.
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A person has a reasonable chance of surviving an automobile crash if the deceleration is no more than 30 "g's" (g = 9.8 m/s^2). Calculate the force on a 65 kg person accelerating at this rate. *
This diagram shows two different forces acting on a skateboarder. The combined mass of the skateboard and the person is 81.5 kg. Based on this information, what is the acceleration of the skateboarder?
A. 0.51 m/s² to the left
B. 1.95 m/s² to the left
C. 0.51 m/s² to the right
D 1.94 m/s² to the right
Answer:
Option C. 0.51 m/s² to the right.
Explanation:
We'll begin by calculating the net force acting on the skateboarder. This is illustrated below:
Force applied (Fₐ) = 52.8 N
Force resistance (Fᵣ) = 11.4 N
Net force (Fₙ) =.?
Net force (Fₙ) = Force applied (Fₐ) – Force resistance (Fᵣ)
Fₙ = Fₐ – Fᵣ
Fₙ = 52.8 – 11.4
Fₙ = 41.4 N to the right
Thus, the net force acting on the skateboarder is 41.4 N to the right.
Finally, we shall determine the acceleration of the skateboarder as shown below:
Mass (m) = 81.5 kg.
Net force (Fₙ) = 41.4 N to the right
Acceleration (a) =..?
Net force (Fₙ) = mass (m) × acceleration (a)
Fₙ = ma
41.4 = 81.5 × a
Divide both side by 81.5
a = 41.4 / 81.5
a = 0.51 m/s² to the right.
Therefore, the acceleration of the skateboarder is 0.51 m/s² to the right.
Answer: .5 m/s to right
Explanation:
Uranium, used in nuclear reactions, is a nonrenewable energy resource
A)
true
B)
false
Answer:
The answer is A) True
Explanation:
Uranium is the fuel most widely used by nuclear plants for nuclear fission. Uranium is considered a nonrenewable energy source, even though it is a common metal found in rocks worldwide. Nuclear power plants use a certain kind of uranium, referred to as U-235, for fuel because its atoms are easily split apart.
HELP ME PLEASEE
Why are chemical processes unable to produce the same amount of energy flowing out of the sun as nuclear fusion
i have no clue about it :(
Answer:
I think because of sun is made from very hot gases
What are the highest energy level electrons of an atom called?
