Answer:
If the acceleration of an object remains constant, then its velocity is constant. False
If the acceleration of an object moving along a line is always 0, then its velocity is constant. True
It is impossible for the instantaneous velocity at all times aless than or equalstless than or equalsb to equal the average velocity over the interval aless than or equalstless than or equalsb. True
A moving object can have negative acceleration and increasing speed. False
Explanation:
First of all, before we can talk of acceleration, then there must be a change in velocity. If the velocity of a body is constant, then there will not be any acceleration at all.
If the acceleration is zero, then there is no change in velocity, the velocity is constant.
The instantaneous velocity is always changing all through the motion hence it cannot be determined at all times to equal the average velocity.
If the acceleration is negative, it simply means that the velocity is decreasing with time. Hence there can't be a negative acceleration and increasing velocity.
A 150 g egg is dropped from 3.0 meters. The egg is moving at 4.4 m/s right before it hits the ground. The egg comes to a stop in 0.072 seconds.
What is the magnitude of force that the ground exerted on the egg?
0.66 N
9.2 N
13 N
180 N
Answer is 9.2 N
Answer: Magnitude of the force exerted on the egg by the ground is 9.2N
Explanation:
Given the following :
Mass of egg (m) = 150g = 0.15kg
Height(h) from which egg is dropped = 3m
velocity of egg before hitting the ground (u) = 4.4m/s
Final velocity of egg (V) = 0
Time taken (t) = 0.072s
Magnitude of the force exerted on the egg by the ground can be found by applying Newton's 2nd law:
Momentum = mass × velocity
From Newton's second law:
Force = mass × change in Velocity with time ;
That is
F = m * ΔV / t
Inputting our values
F = 0.15 * (4.4 - 0) / 0.072
F = 0.15 × (4.4 / 0.072)
F = 0.15 × 61.11
F = 9.16N
F = 9.2N
Answer:
9.2 N
Explanation:
Just took practice quiz
A cars start from rest . after 10 seconds its acceleration become 2 meter per second find its final velocity
Answer:
[tex] \boxed{\sf Final \ velocity = 20 \ m/s} [/tex]
Given:
Initial velocity (u) = 0 m/s
Acceleration (a) = 2 m/s²
Time taken (t) = 10 seconds
To Find:
Final velocity (v)
Explanation:
[tex]\sf From \ equation \ of \ motion: \\ \sf v = u + at \\ \\ \sf v = 0 + 2(10) \\ \\ \sf v = 2 \times 10 \\ \\ \sf v = 20 \ m/s[/tex]
The vibrations of a string fixed at both ends are represented by y=16sin(πx/15 )cos(96πt). Where x and y are in cm and t in seconds. Then the phase difference between the points at x=13cm and x=16 in radian
Answer:
Explanation:
y = 16 sinπx/15 cos(96πt)
When t = 0
y = 16 sinπx/15
here πx/15 is phase of the point at x
if x = 13
Phase = 13π/15
if x = 16
Phase = 16π/15
Phase difference
= 16π/15 - 13π/15
= 3π/15
= π/5 radian .
How does a fuse differ from a circuit breaker?
O A. A fuse must be replaced after use, but a circuit breaker can be
reset.
OB. A fuse works by flipping open, while a circuit breaker melts.
O C. A fuse opens the circuit to stop current, but a circuit breaker
closes the circuit.
O D. A fuse works when it detects a high resistance, but a circuit
breaker works when it detects a high voltage.
Answer:
A. A fuse must be replaced after use, but a circuit breaker can be
reset.
Explanation:
A fuse works by actually melting, so there is physical damage that interrupts conduction of current due to lack of conductive material.
The circuit breaker is a switch operated automatically when there is excess flow of current. It interrupts that way the flow of current, but can simply get reset (back to its original close position) once the problem that caused the overflow of current in the circuit is found.
This better agrees with answer A in the list of possible choices.
how does gravitational pull affect planets with the same mass but different distance from the sun?
Answer:
it just pulls them at the same time
Explanation:
A 500 kg satellite experiences a gravitational force of 3000 N, while moving in a circular orbit around the earth. Determine the speed of the satellite.
Answer:
Speed of the satellite V = 6.991 × 10³ m/s
Explanation:
Given:
Force F = 3,000N
Mass of satellite m = 500 kg
Mass of earth M = 5.97 × 10²⁴
Gravitational force G = 6.67 × 10⁻¹¹
Find:
Speed of the satellite.
Computation:
Radius r = √[GMm / F]
Radius r = √[(6.67 × 10⁻¹¹ )(5.97 × 10²⁴)(500) / (3,000)
Radius r = 8.146 × 10⁶ m
Speed of the satellite V = √rF / m
Speed of the satellite V = √(8.146 × 10⁶)(3,000) / 500
Speed of the satellite V = 6.991 × 10³ m/s
The Enterprise goes into orbit around a mysterious planet. The ship moves at 4200 m/s in a circle of radius 4.91 x 10^7 m. What is the mass of the
planet?
Answer:
M = 1.3*10^25 Kg
Explanation:
Answer:
Explanation:
im not saying this bc of the person on top but its 1.3 and then 10^25 i done physics on acellus and i passed with an 90% and i have all of my notes and so the person on top of me was right :)
an object experiences buoyant force of 15.9 n when immersed in a fluid of density 917 kg/m^3. what is the volume of the object?
Answer:
0.00176
Explanation:
Credit to the person above.
Could anyone explain how to size of an image works in a pinhole camera?
A motor transfers 12 kJ of energy in 30 s. Calculate its power.
Answer:
power=400Watt
Explanation:
work done =12kJ=12×10³=12000j
time taken=30s
power=?
as we know that
power=work done/time taken
power=12000J/30s
power=400Watt
i hope this will help you :)
Two resistors connected in series (R1, R2) are connected to two resistors that are connected in parallel (R3,R4). The series-parallel combination is connected to a battery. Each resistor has a resistance of 10.00 Ohms. The wires connecting the resistors and battery have negligible resistance. A current of 2.00 A runs through resistor R1. What is the voltage supplied by the voltage source?
Explanation:
R1=R2=R3=R4=10 ohms
V=IR
V=2.10
V=20v
which of these is the correct size order starting with the smallest first
Universe, Galaxy, sun
Sun, Galaxy, universe
Galaxy, Sun, universe
Answer:
Universe, Galaxy, Sun.
Explanation:
The universe is everything. It contains billions of galaxies.
A galaxy, such as our Milky Way Galaxy, is a collection of solar systems orbiting around a central core. Most galaxies have a supermassive black hole at their centres.
Then the sun smallest.
a force of 50 n acts on abody of mass 5 kg .calculate the acceleration produced
Answer:
a = 10 m/s²
Explanation:
Given:
Force = F = 50 N
Mass = m = 5 kg
Required:
Acceleration = a = ?
Formula:
F = ma
Solution:
Rearranging the formula for a
=> a = F/m
=> a = 50/5
=> a = 10 m/s²
Which object has the most gravitational potential energy?
O A. A 5 kg book at a height of 2 m
B. An 5 kg book at a height of 3 m
C. An 8 kg book at a height of 3 m
O D. A 8 kg book at a height of 2 m
SUBARU
Answer:
D
Explanation:
its the heaviest so i would assume its D
The dimensional formula for specific latent heat is
Answer:
The dimensional formula for specific latent heat is L²/T²
Explanation:
The unit of specific latent heat is J/kg
Please verify these are correct. No work needs to be shown unless I've made a mistake. Thank you.
Answer:
Those are correct, well done.
Answer:
your workings are correct
A 0.675 kg mass is attached to a
spring of spring constant 42.4 N/m,
pulled, and released. What is the
frequency of the resulting
oscillation?
(Unit = Hz)
Answer:
1.26
Explanation:
f=1/(2pi) square root k/m
f=1/(2pi) square root 42.4/.675
f=1.26 I just did this question and found this right
Is it necessary to convert time in its S.I unit while solving acceleration and velocity numericals
Answer:
yes
Explanation:
In any calculation, we make sure we use all quantity in it simplest s.i unit
for better understandingfor a clearer work analysisHope this will help
If I were to fill a water bottle full of air and go up in elevation, would the water bottle expand or shrink? If I were to fill a water bottle full of air and go down in elevation, would the water bottle expand or shrink? I am at elevation 20000 I think.
Answer:
a. It would shrink
b. It would expand
Explanation:
a. Since the water bottle is filled with air at atmospheric pressure at 20000 ft, and since atmospheric pressure decreases with altitude, when we go up in elevation.
The pressure exerted by the molecules of air in the water bottle seek to balance out the atmospheric pressure as we go higher. Since the atmospheric pressure exerted by the molecules of air in the atmosphere are greater than that exerted by the molecules of air in the water bottle, this causes the volume of the water bottle to decrease and thus shrinks the water bottle until the pressure balances out
b. Since the water bottle is filled with air at atmospheric pressure at 20000 ft, and since atmospheric pressure increases with decreasing altitude, when we go down in elevation.
The pressure exerted by the molecules of air in the water bottle seek to balance out the atmospheric pressure as we go lower. The water bottle expands until the atmospheric pressure outside equals the pressure inside the water bottle.this causes the volume of the water bottle to increase and thus expands the water bottle until the pressure balances out
How many exercises are there?
Answer:
There are 4 exresise ;endurance, strength, balance, and flexibility. Each one has different benefits.
Explanation:
Endurance activities, often referred to as aerobic, increase your breathing and heart rates.
Your muscular strength can make a big difference. Strong muscles help you stay independent and make everyday activities feel easier, like getting up from a chair, climbing stairs, and carrying groceries.
Balance exercises help prevent falls, a common problem in older adults that can have serious consequences.
Stretching can improve your flexibility. Moving more freely will make it easier for you to reach down to tie your shoes or look over your shoulder when you back your car out of the driveway.
hope this can help you...
1-D Kinematics
A car starts at a position of -153 m
and undergoes a displacement of
512 m. What is its final position?
(Unit = m)
Answer:
hope it helps you...........
A 2.2 kW stove burner operates on a 240 V household circuit.
Answer:
I = 9.17 A
Explanation:
We have,
Power of a stove is 2.2 kW
Voltage on which it operates is 240 V
Let us assume that it is required to find the current flowing in the circuit. Electric power is given by :
[tex]P=IV\\\\I=\dfrac{P}{V}\\\\I=\dfrac{2.2\times 10^3}{240}\\\\I=9.17\ A[/tex]
So, the current in the stove burner is 9.17 A.
A football player kicks a ball at a 30o angle from the ground with an initial velocity of 15 m/s. What is the final velocity of the ball when it hits the ground?
Given that,
Angle = 30°
Initial velocity = 15 m/s
We need to calculate the time of flight
Using formula of time of flight
[tex]T=\dfrac{2u\sin\theta}{g}[/tex]
Where, u = initial velocity
g = acceleration due to gravity
Put the value into the formula
[tex]T=\dfrac{2\times15\sin30}{9.8}[/tex]
[tex]T=1.5\ sec[/tex]
We need to calculate the final velocity of the ball
Using equation of motion
[tex]v=u+gt[/tex]
[tex]v=15+9.8\times1.5[/tex]
[tex]v=29.7\ m/s[/tex]
Hence, The final velocity of the ball is 29.7 m/s.
What will happen to the astronaut when the jets produce these four forces: 10N, 10N, 9N, 9N?
what are laws of newton
Answer:
In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction
Explanation:
Answer:
Newton's Law of Motion
1- Every object persists in its state of rest or uniform motion - in a straight line unless it is compelled to change that state by forces impressed on it.
2- Force is equal to the change in momentum per change in time. For a constant mass, force equals mass times acceleration.
3- For every action, there is an equal and opposite reaction.
Would this be 5.58 g or 5.58 kg?
Answer:
Kg
Explanation:
Answer:
5.58 kg
Explanation:
The SI unit for mass is kg. A Newton is defined as:
N = kg m/s²
So the answer would be 5.58 kg.
Which of the following would double the amount of current flowing through a piece of metal wire? Which of the following would double the amount of current flowing through a piece of metal wire? Quarter the voltage across it. Quadruple the voltage across it. Double the voltage across it. Halve the voltage across it.
Answer:
Double the voltage across it.
Explanation:
From Ohm's Law, we have the relation, as follows:
Voltage = (Current)(Resistance)
If we keep the resistance of the wire as a constant, then we get the relation between voltage and current as follows:
Voltage = (Constant) * Current
Voltage α Current
This shows that the current has a direct proportionality with the voltage. So, if we want to double the current flowing through a piece of metal wire, then we must Double the voltage across it.
It can be confirmed by formula as:
V = IR
Now, doubling the voltage:
V' = 2 IR
substituting value of IR = V:
V' = 2 V
What happens to the force needed to stretch an elastic object?
Answer:
the force pulls each other cause its just physics
Two objects charged with an equal amount of charge interact with each other with a force
of 3.62 Newton when separated by a distance of 16.9 cm. Determine the magnitude of
the charge on each object.
Please check attachment
The magnitude of the charge on each object is 3.4 μC.
What is electrostatic force?The electrostatic force F between two charged objects placed distance apart is directly proportional to the product of the magnitude of charges and inversely proportional to the square of the distance between them.
F = kq₁q₂/r²
where k = 9 x 10⁹ N.m²/C²
Given is the identical charge q₁ = q₂ =q, distance r =16.9cm =0.169m and the force F = 3.62N.
Substitute the values, we get
3.62 = 9 x 10⁹x q² / (0.169)²
q = 3.3894 x 10⁻⁶ C
q = 3.4 μC
Thus, the charge on each object is 3.4 μC.
Learn more about electrostatic force.
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Write one or two sentences to compare the internal energy of a molecular gas with the internal energy of a monatomic gas.