Answer:
The SI units for energy is Joules.
Answer: Joules
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A bus starts to move from rest. if it's velocity becomes 90 km per hour after 8 seconds , calculate it's acceleration (numerical problem)
Assuming the bus undergoes constant acceleration, it is given by:
a = (Vf-Vi)/Δt
a is the acceleration, Vf is the final velocity, Vi is the initial velocity, and Δt is the elapsed time.
Given values:
Vf = 90km/hr = 25m/s (the conversion rate from km/hr to m/s is 1/3.6)
Vi = 0m/s (starts from rest)
Δt = 8.0s
Plug in the values and solve for a:
a = (25-0)/8
a = 3.125m/s²
Round to 2 significant figures.
a = 3.1m/s²
To balance a chemical equation we use______.
-coefficients
-subscripts
Answer:
Coefficients
Explanation:
Coefficients are used to balance chemical equations.According to the law of conservation of mass, the mass of the reactants in a chemical equation should be equivalent to the mass of the products.The conservation of mass is achieved in chemical equations is achieved through balancing chemical equations. Balancing chemical equations is a try and error of putting appropriate coefficients to the reactants or products to ensure that the number of atoms of each element are equal on the side of the reactants and that of products.1. Which quantity is the transfer of energy?
work
motion
force
Answer:
work
Explanation:
Work is the transfer of energy by a force to another object. Energy is transferred when a force causes an object to be displaced.
Work is defined as the transfer of energy by a force. When a force is applied over a distance, work is done, and energy is transferred from one object to another. Work is measured in joules, with 1 joule being equivalent to 1 newton-meter.
HOW DO PROTONS, NEUTRONS AND ELECTRONS DIFFER?
The protons has the positive charge, neutron has no charges and electrons have the negative charge.
Explanation:
The basic difference between the particles of the atom are their charges and their orientation in the atom. The proton and the neutron are present in the nucleus of the atom whereas the electrons are at the periphery of the atom. The nucleus is stationary in orientation having proton and neutron in it, whereas the periphery as the electrons are moving. Electrons revolves around the nucleus.
A little bumblebee accelerates uniformly at 1.5 m/s² from rest to 22 m/s. Immediately upon reaching 22m/s, the brakes are applied, and it stops 2.5 s later. Find the total distance traveled.
Answer:
190 m
Explanation:
Displacement during acceleration:
v² = v₀² + 2a(x - x₀)
(22 m/s)² = (0 m/s)² + 2(1.5 m/s²)(x - 0 m)
x = 161.333 m
Displacement after deceleration:
x = x₀ + ½ (v + v₀)t
x = 161.333 m + ½ (0 m/s + 22 m/s)(2.5 s)
x = 188.833
Rounded to 2 sig-figs, the bumblebee travels a distance of 190 m.
A brick has a greater mass than a sponge has. Why is the acceleration due to gravity the same for both objects?
Answer:Gravity
Explanation: all objects fall at the same time no matter the weight or size
The only thing that would change the time of falling of said object is if the object has greater air resistance like a feather
All objects accelerate at the same rate due to gravity (9.8 m/s^2) because of the equivalence principle, which states that inertial mass and gravitational mass are equal, causing a balance between the gravitational force and inertia.
The acceleration due to gravity is the same for all objects, regardless of their mass, because gravity affects all objects equally. This is a result of what is known as the equivalence principle, which states that the inertial mass (resistance to acceleration) and the gravitational mass (how much force is exerted by gravity) of an object are equivalent. Therefore, when looking at the formula for force (¹Force equals mass times acceleration), a lighter object like a sponge and a heavier object like a brick, when dropped, will both experience the same acceleration of 9.8 m/s2 because the greater gravitational force on the brick is exactly balanced by its greater inertia. This phenomenon dismisses the mass of Earth in calculations as it is significantly larger than that of the objects.
How much current will flow through a 470-Ohm resistor if a 9-volt battery is used?
Answer:
For a 470-Ohm resistor connected to a 9-votl battery the current that will flow is 0.019A or 19mA
Explanation:
Ohm's law states that the voltage v along a resistor is directly proportional to the current i flowing through the resistor.
[tex]v = i R[/tex]
Clear i from the equation above
[tex]i = \frac{v}{R}[/tex]
[tex]i = \frac{9volt}{470ohm} =0.019A[/tex]
The current flowing through a 470-Ohm resistor with a 9-volt battery is approximately 0.0191 Amperes.
Explanation:In order to determine the current flowing through a resistor, we can use Ohm's Law, which relates voltage, current, and resistance. Ohm's Law states that current (I) is equal to the voltage (V) divided by the resistance (R). So, in this case, we can calculate the current flowing through a 470-Ohm resistor with a 9-volt battery using the formula:
I = V / R
Substituting the given values, we have:
I = 9 V / 470 Ohm
Simplifying the expression gives us the current:
I ≈ 0.0191 A
Therefore, approximately 0.0191 Amperes (or 19.1 milliamperes) of current will flow through the 470-Ohm resistor when a 9-volt battery is used.
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What is the vector product of two vectors????
Answer:
The magnitude of the vector product of two vectors can be constructed by taking the product of the magnitudes of the vectors times the sine of the angle (<180 degrees) between them. The magnitude of the vector product can be expressed in the form: and the direction is given by the right-hand rule.
Answer:
The vector product of two vectors is a vector perpendicular to both of them. Its magnitude is obtained by multiplying their magnitudes by the sine of the angle between them.
Which of the following has the greatest momentum?
A. a tortoise with a mass of 275 kg moving at a velocity of 0.55 m/s
B. a hare with a mass of 2.7 kg moving at a velocity of 7.5 m/s
C. a turtle with a mass of 91 kg moving at a velocity of 1.4 m/s
D. a roadrunner with a mass of 1.8 kg moving at a velocity of 6.7 m/s
Answer:
A
Explanation:
Momentum is mass times velocity.
A. 275 kg × 0.55 m/s = 151.25 kgm/s
B. 2.7 kg × 7.5 m/s = 20.25 kgm/s
C. 91 kg × 1.4 m/s = 127.4 kgm/s
D. 1.8 kg × 6.7 m/s = 12.06 kgm/s
So A has the greatest momentum.
Momentum of a body is the product of the mass of the body and its velocity. The momentum of the tortoise is greatest. Thus option A is the correct option.
What is momentum?Momentum of a body is the product of the mass of the body and its velocity. It can be given as,
[tex]p=mv[/tex]
Given options are,
A) A tortoise with a mass of 275 kg moving at a velocity of 0.55 m/sThe mass of the tortoise is 275 kg.
The velocity of the tortoise is 0.55 m/s.
Thus momentum of tortoise,
[tex]p_a=275\times0.55\\p_a=151.25[/tex]
Hence the momentum of the tortoise is 151.25 kg-m per second.
B) A hare with a mass of 2.7 kg moving at a velocity of 7.5 m/sThe mass of the hare is 2.7 kg.
The velocity of the hare is 7.5 m/s.
Thus momentum of hare,
[tex]p_b=2.7\times7.5\\p_b=20.25[/tex]
Hence the momentum of the hare is 20.25 kg-m per second.
C) A turtle with a mass of 91 kg moving at a velocity of 1.4 m/sThe mass of the turtle is 91 kg.
The velocity of the turtle is 0.14 m/s.
Thus momentum of turtle,
[tex]p_c=91\times1.4\\p_c=127.4[/tex]
Hence the momentum of the turtle is 127.4 kg-m per second.
D) A roadrunner with a mass of 1.8 kg moving at a velocity of 6.7 m/sThe mass of the roadrunner is 1.8 kg.
The velocity of the roadrunner is 6.7 m/s.
Thus momentum of roadrunner,
[tex]p_d=1.8\times6.7\\p_d=12.06[/tex]
Hence the momentum of the roadrunner is 12.06 kg-m per second.
Hence the momentum of the tortoise is greatest. Thus option A is the correct option.
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When work is measured in joules and time is measured in seconds power is measured in kilograms true or false
The answer is:
False, the power measured is equivalent to Watt.
Why?The power is the rate which a determinate amount of work is done, being this, the amount of work done over time, which is also equal to the energy used over time.
We can calculate the power using the following formula:
[tex]Power=\frac{Work}{Time}[/tex]
Where,
Power, is quantity of energy used over time, measured in Watt.
Work, is the energy transferred when an object is in motion, covering a distance, it's measured in Joules (N.m)
Time, is the time measured in seconds.
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Calculate the total resistance for a 650ohm , a 350 ohm , and a 1000 ohm resistor connected in series
Answer:
2000 ohms
Explanation:
Resisters in series just add.
Rt = R1 + R2 + R3
R1 = 650 ohm
R2 = 350 ohm
R3 = 1000 ohm
Rt = 650 + 350 + 1000
Rt = 2000 ohms.
The total effective resistance of several resistors in SERIES is just the sum of all the individual resistances.
So the effective resistance of 650Ω, 350Ω, and 1,000Ω in series is
Sum = (650Ω + 350Ω + 1,000Ω)
Sum = 2,000 ohms
sample of pure water has a hydronium concentration of 1.0 × 10-7 M. What is the pH of the water?
Answer:
The pH of the water is 7.
Explanation:
The pH of the solution is defined as negative logarithm of H^+ or hydronium ions ions in the solution.
pH=-\log[H^+]
So, H^+ concentration of water = 1.0\times 10^{-7} m
pH=-\log[1.0\times 10^{-7}]=7
The pH of the water is 7.
The pH of pure water with a hydronium concentration of 1.0 × 10⁻⁷ M is 7, indicating that the water is neutral.
The pH of a solution is a measure of its acidity or alkalinity. In the given sample of pure water with a hydronium ion concentration of 1.0×10⁻⁷ M, we calculate the pH by taking the negative logarithm of the hydrogen ion concentration, which here is -(-7), giving us a pH of 7. This pH value indicates that the solution is neutral, since pure water has a pH of 7 at 25 °C.
This position-time graph describes an object's motion. Use it to determine the
displacement (in m) of the object after 6.0 seconds of motion. Enter the
appropriate + or - sign.
Displacement=?
We're happy that you're asking for the "displacement", because displacement is simply the straight-line distance between the start-point and end-point, and we don't care about any of the motions or gyrations along the way.
From the graph:
-- The location of the object at time-zero, when time begins, is 10 meters.
-- The location of the object after 6.0 seconds is 4 meters.
-- The distance between the start-point and end-point is
(final location) - (initial location)
-- So Displacement = (4 meters) - (10 meters)
Displacement = -6 meters
The displacement of the object from starting to endpoint is
[tex]d=+6m[/tex]
From the question we are told that:
Displacement Time t=6sec
Displacement
Displacement is simply the distance between the starting point and the endpoint.We do not make reference to variant distances covered just the starting and endpoint.
Generally, the equation for Displacement is mathematically given by
[tex]D=x-y[/tex]
Where
x=starting point
y= endpoint.
Therefore
[tex]d=10-4[/tex]
[tex]d=+6m[/tex]
In conclusion
The displacement of the object from starting to endpoint is
[tex]d=+6m[/tex]
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