Answer:
Time, t = 50.8 seconds.
Explanation:
Given the following data;
Mass = 6000 kg
Force = 2950 N
Initial velocity = 4 m/s
Final velocity = 29 m/s
To find time;
First of all, we would determine the acceleration of the truck using the following formula;
Force = mass * acceleration
2950 = 6000 * acceleration
Acceleration = 2950/6000
Acceleration = 0.492 m/s²
Next, we find time using the first equation of motion;
[tex] V = U + at[/tex]
Where;
V is the final velocity.
U is the initial velocity.
a is the acceleration.
t is the time measured in seconds.
Making time, t the subject of formula, we have;
[tex] t = \frac{V - U}{a}[/tex]
Substituting into the equation, we have;
[tex] t = \frac{29 - 4}{0.492}[/tex]
[tex] t = \frac{25}{0.492}[/tex]
Time, t = 50.8 seconds.
A pickup truck of mass 3500 kg moving at 72 kmh-1 collides head-on with a car of mass 2000 kg moving in the opposite direction. After colliding, both the pickup and the car came to rest.
(i) An 8 grade physics student commented that the law of conservation of momentum was NOT upheld in this collision, since both vehicles were moving before the collision and none of them was moving after colliding. State whether or not you agree with the student's comment and give a reason why you agree or disagree.
Answer:
Explanation:
The Law of Momentum Conservation says that the mass times the velocity of the truck + the mass times the velocity of the car BEFORE they hit has to = the mass of the tuck times the velocity of the truck + the mass of the car times the velocity of the car AFTER they hit. If we don't know the velocity of the car, we can solve for it, and then we can say that Momentum has been conserved. Before I do that, I am going to tell you that 72 kmh is 20 m/s.
[tex](3500*20+2000x)_b=0_a[/tex] The 0 is because if there is no velocity after they hit, it doesn't matter what the velocities are; anything times 0 is 0.
70,000 + 2000x = 0 where x is the velocity of the car
70,000 = -2000x so
x = -35.
As long as the car was initially traveling 35 m/s in the opposite direction )hence, the - sign), momentum is conserved. So I'm not sure exactly how you can answer this otherwise.
Balance the equation-
Al+Mn02 ———-> Mn + Al2O3
Answer:
4Al + 3Mno2 --> 2Al2o3 + 3Mn
Explanation:
Al = 1 x 4 = 4
Mn = 1 x 3 = 3
O = 2 x 3 = 6
----------
Al = 2 x 2 = 4
Mn = 1 x 3 = 3
O = 2 x 3 = 6
Please help!! I need this asap I will mark brainliest!!
Answer:
50N to the right
Explanation:
You would find net force by adding the 20 and the 30 together since they are being pushed to the same side (the right). Therefore, the answer will be 50N to the right.
Two closed organ pipe gives 4 beats when sounded together at 5°C. Calculate the number of beats in 35°C
Answer:
The number of beats is 10.58 in 35°C.
Explanation:
The beat frequency is given by : f₁-f₂
At 5°C, f₁-f₂ = 4
We need to find the number of beats in 35°C.
The frequency in a standing wave is proportional to [tex]\sqrt T[/tex].
So,
[tex]\dfrac{f_1-f_2}{f_1'-f_2'}=\dfrac{\sqrt {T}}{\sqrt{T'}}\\\\f_1'-f_2'=(f_1-f_2)\times \dfrac{\sqrt{T'}}{\sqrt{T}}\\\\f_1'-f_2'=4\times \dfrac{\sqrt{35}}{\sqrt{5}}\\\\f_1'-f_2'=10.58[/tex]
So, the number of beats is 10.58 in 35°C.
Determine the magnitude of the electrostatic force on a 0.06000 C charged object when it is placed in an electric field of magnitude 1500 N/C
Answer:
Explanation:
Use the following equation:
[tex]E=\frac{q}{F}[/tex] and solve for F:
[tex]F=\frac{q}{E}[/tex] and filling in:
[tex]F=\frac{.0600}{1500}[/tex]
F = 4.0 × [tex]10^{-4[/tex] N
17. What is the gain in gravitational potential energy of a body of weight 2000 N as it rises from a height of 20 m to a height of 25 m above the earth's surface?
(A) 400 J
(B) 1 000 J
(C) 10 000 J
(D) 20 000 J
Answer:
C) 10000 J
Explanation:
∆p.e =mg∆h
= 2000 × 5
= 10000J
How can we protect space shuttles or astronauts from space radiation in the absence of the atmospheric layer?
What is the role of gravity in maintaining the atmospheric layer around the earth ?
WILL MARK AS BRAINLIEST
Resistance is equal to the potential difference divided by what? Give the name, not the unit of
measurement
We have that Resistance is equal to the potential difference divided by
Current
The Name of the Quantity is Current
From the question we are told
Resistance is equal to the potential difference divided by what? Give the name, not the unit of measurement
Generally the equation for Resistance is mathematically given as
[tex]R=\frac{V}{I}[/tex]
Where
I=Current
V=Voltage
R=Resistance
Therefore
Resistance is equal to the potential difference divided by
Current
The Name of the Quantity is Current
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If the distance between two objects is increased to four times the original distance.how will that increase change the force of attraction between the object
Answer:
Gravitational force becomes sixteen times lesser. The strength of the gravitational force between two objects is dependent on their mass. Gravitational force will be weaker if the objects move further away from each other.
This was used to solve for the gravitational force,
G = gravitational constant
m = mass of the first object
M = mass of the second object
d = distance between the two objects
[G * (m*M) / 16d^2] = 1/16
what should you do to change a value in SI units in U.S customary units
Answer:
To convert values expressed in SI unit to the other unit divide the SI unit by the value in the Multiply By column.
Explanation:
*URGENT* Why is understanding motion so important? Be sure to explain in your own words.
Answer:
Motion is one of the important issues of Physics. We know that if we are not moving but still earth is moving. Motion is a bit of the machinist's Department of Physics. Several laws are provided for explaining the theory of motion and evolution in motion. The motion and transformation are defined in terms of strength which is wanted for creating an object in a motion state.
A construction worker drops a 2.20 kg hammer from a roof. At a distance of 4.50 m above the ground, the hammer's total mechanical energy is 188 J. Calculate the kinetic energy of the hammer at this height.
Answer:
Kinetic energy = 90.98 J
Explanation:
Given that,
The mass of a hammer, m = 2.2 kg
At a distance of 4.50 m above the ground, the hammer's total mechanical energy is 188 J.
We need to find the kinetic energy of the hammer at this height.
We know that,
Mechanical energy = kinetic energy + potential energy
[tex]188=K_E+mgh\\\\K_E=188-mgh\\\\K_E=188-2.2\times 9.8\times 4.5\\\\K_E=90.98\ J[/tex]
So, the kinetic energy of the hammer at this height is equal to 90.98 J.
This wave, in total, is 30m. What is it's wavelength? *
Your answer
wavelength = d / number of Oscillation
this implies that wavelength = 30/3= 10
number of wavelengths = 10
Answer:
Looking at the wave diagram
Its wavelength 3full wavelength which total to 30m...
So
3y = 30
y= 30/3
y=10meters
So a single wavelength is 10m.
Hope it helps
True or False: Sound waves are the longest wave lengths on the electromagnetic spectrum.
Answer:
False: Wave lengths on the electromagnetic spectrum are "electromagnetic",
They are transverse waves,
Sound waves are "longitudinal" waves and depend on the motion of the medium of transmission for propagation.
Phecda has a surface temperature of approximately 9500 K and a luminosity of 63. Identify the name of the star found on the Characteristics of Stars chart in the 2011 Edition Reference Tables for Physical Setting/Earth Science that has a surface temperature and luminosity closest to Phecda. a) Deneb b) Rigel c) Sirius d) Pollux
Answer:
Sirius
Explanation:
On the HR diagram Sirius is the closet.
c) Sirius has a surface temperature and luminosity closest to Phecda
What is surface tension and luminosity of a star ?
Surface temperature is the temperature at or near a surface. Luminosity is an absolute measure of radiated electromagnetic power (light), the radiant power emitted by a light-emitting object over time.
As it can be observed from the graph attached that Sirius have a surface temperature of about 10,000 K which can be considered as closest to 9500 K comparatively to other stars and if we see the the y coordinate of Sirius which is the luminosity representing axis , then Sirius have a value of luminosity closer to 63
hence correct answer is c)Sirius
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Select the correct answer. What happens to the molecules within a gas when the gas condenses?
When gas molecules condense, they lose energy. Condensation will lose electrons and will slow down the compaction of electrons to each other which results to reduction of heat energy. As heat energy decreases, it allows those lose electrons to combine with liquid.
If he jumps from the plane with a velocity of +2 ft/s and, after 7 seconds of free fall, he has a velocity of -223ft/s, what is his displacement?
Answer:
his displacement is 772.85 ft
Explanation:
Given;
initial velocity of his jump, u = 2 ft/s
final velocity of his jump, v = - 223 ft/s
time of motion, t = 7 seconds
acceleration due to gravity, g = 32.17 ft/s²
Let downward motion = positive direction
Let his displacement after 7s = Δh
Apply the following kinematic equation to determine his displacement.
[tex]v^2 = u^2 + 2g\Delta h\\\\(-223)^2 = (2)^2 + (2\times 32.17)\Delta h\\\\49,729 = 4 + 64.34\Delta h\\\\-64.34 \Delta h = 4 - 49,729\\\\-64.34 \Delta h = -49,725\\\\\Delta h = \frac{49,725}{64.34} \\\\\Delta h = 772.85 \ ft[/tex]
Therefore, his displacement is 772.85 ft
The lower the pH number is, the more ______ the solution.
Answer:
more acidic (less base)
hope this helps! :)
explain the working principle of the moving coil coil galvanometer
Answer:
When a current-carrying coil is suspended in a uniform magnetic field it is acted upon by a torque. Under the action of this torque, the coil rotates and the deflection in the coil in a moving coil galvanometer is directly proportional to the current flowing through the coil.
A puppy finds a rawhide bone and begins to pull it with a force, Ft. The free-body diagram is shown.
Which describes what happens to the bone?
Answer:
it begins to move to the right! :)
The process of converting a solid into gaseous state is called
If two opposing forces are equal, then the net force is 0 N.
true or false?
Answer:
false
Explanation:
what would a permanetly magnetic substance be called
Answer:
A Permanent magnet or a static magnet
Explanation:
A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic).
when we put our finger in front a a lit flashlight, light appears to pass through our finger when seen on a wall,how?
Answer:
diffraction phenomenon
Explanation:
When you place your finger in front of a flash, you have a diffraction phenomenon whereby the light fills a part of the space with the first maximum diffraction.
In this case the phenomenon of geometric optics cannot explain the process of bending the beam around an object.
a student places 8 similar coins in a pile . the height of the pile of coins is 2.4 cm calculate the average thickness of one coin
Answer:
0.3 cm
Explanation:
[tex] \frac{2.4}{8} \\ = 0.3[/tex]
• ¿Qué rapidez tendrá un sonido de 150 Hz con una longitud de onda de 2 metros?
Answer:
Speed = 300 m/s
Explanation:
Given the following data;
Frequency = 150 Hz
Wavelength = 2 meters
To find the speed of the wave;
Mathematically, the speed of a wave is given by the formula:
[tex] Speed = wavelength * frequency [/tex]
Substituting into the formula, we have;
[tex] Speed = 2 * 150[/tex]
Speed = 300 m/s
what is uniform motion?
Your dog ran away from home at 1:00 this afternoon. It is now 1:30. You know that he walks with an average speed of 1 m/s. Which of the following pieces of information is most important for finding your dog?
Answer:
30m/s
Explanation:
Which direction the dog is going is the piece of information which is most important for finding the dog. Thus, the correct option is C.
What is Average speed?The average speed is the total distance traveled by the object in a particular interval of time period. The average speed is a scalar quantity because it is represented by the magnitude only and does not have direction. The SI unit of average speed is the same as speed which is meter per second (m/s) or ms⁻¹.
Average speed = Total distance traveled by the object/ Total time taken
One of the most important thing for the finding of dog is the direction in which the dog is going.
Therefore, the correct option is C.
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Your question is incomplete, most probably the complete question is:
Your dog ran away from home at 1:00 this afternoon. It is now 1:30. You know that he walks with an average speed of 1 m/s. Which of the following pieces of information is most important for finding your dog?
A. whether the dog has eaten recently
B. if the dog was chasing a squirrel
C. which direction the dog is going
D. whether the dog is alone
Which statements describe acceleration? Check all that apply. Negative acceleration occurs when an object slows down in the positive direction. Negative acceleration occurs when an object slows down in the negative direction. Negative acceleration occurs when an object speeds up in the negative direction. Positive acceleration occurs when an object speeds up in the positive direction. Positive acceleration occurs when an object speeds up in the negative direction. Positive acceleration occurs when an object slows down in the negative direction
Answer:
Negative acceleration occurs when the acceleration vector points to the left.
1. Object slowing down in the positive direction.
2. Object speeding up in the negative direction.
Following six statements:
1. T
2. F
3. T
4. T
5. F
6. T
Check direction of acceleration vector.
When light hits something like a raindrop or a prism, it will...
it will
One: Diffract
Two: Be Absorbed
or
Three: Refract
Answer:
three: refracts
the light bends when passing thought a raindrop or prism
