Explanation:
Initial speed, u = 0 km/h
Final sped, v = 50 km/h
Time, t = 8 s
1 minute = 60 seconds
⇒ 1 s = (1/60) minutes
⇒8 s = 0.1334 minutes
Acceleration,
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{50\cdot\dfrac{5}{18}}{8}\\\\a=1.73\ m/s^2[/tex]
Hence, this is the required solution.
Find the momentum
of a
30g ball traveling
12 m/s
Answer:
0.36 kgm/s
Explanation:
Formula for momentum is :
P=mv
p is momentum
m is mass = 30g = 0.03kg
v is velocity = 12 m/s
P= 0.03 x 12
P = 0.36 kgm/s
1 lb equals how many grams
Answer:
1 lb. is 453.592 grams
Explanation:
1lb is 453.592 grams
Sarah was trying to explain electromagnetic waves energy to her lab partner. She said that microwaves have more energy than infrared
waves. Her partner Jose argued that infrared waves have more energy Who is right and provides the correct justification?
A Jose is correct because infrared waves have a smaller amplitude than microwaves
B. Jose is correct because infrared waves have a greater frequency than microwaves.
C. Sarah is correct because microwaves have a greater frequency than infrared.
Sarah is correct because microwaves have a smaller wavelength than infrared.
Net force = ?
Net force = ?
1
6 N
The net force for example A is
NA
The net force for example B is NA
The net force for example A is 4N. The net force for example B is 3N.The net force with N will be calculated by following formulas
FNet = F1 + F2 + F3…. + FN.
FNet = Fa + Fg.
FNet = Fa + Fg + Ff + FN.
where N is the number of forces acting on the body.
What kind of force is 1 N?This definition refers to the force required to accelerate a kilogram of mass by one meter per second. In the foot-pound-second (English, or customary) system, one newton is equivalent to roughly 0.2248 pounds of force, or 100,000 dynes in the centimeter-gram-second (CGS) system.
How does net force appear?A car, for instance, has a net force of zero even though it is moving when it is driving at a steady 50 mph on the highway due to the lack of acceleration.
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how are open and closed systems related to energy?
Answer:
The stovetop system is open because heat can be lost into the air. A closed system is one that cannot transfer energy to its surroundings.
How do you measure the weigh of an object
Answer: Weight is a measure of the force of gravity pulling down on an object. It depends on the object's mass and the acceleration due to gravity, which is 9.8 m/s2 on Earth. The formula for calculating weight is F = m × 9.8 m/s2, where F is the object's weight in Newtons (N) and m is the object's mass in kilograms.
Answer:gravity pulling down on an object
Explanation:
PLESE HELP!! ILL MARK BRAINLYEST!!
Most of the energy released by nuclear fission is in the form of ________ rays.
A. alpha
B. beta
C. gamma
D. omega
3. A cat is moving at 18 m/s when it accelerates at 4 m/s2 for 2 seconds. What is
his new velocity?
Answer:
v=u+at
v=8+(4x2)
v=16m\s2
Which three statements could explain the increase in the deer population? A. Rainfall was above average over the past five years B. A hawk species settled into the area five years ago C. Extremely harsh winters occurred during the past five years D. The number of cattle ranchers decreased in the past five years E. The law allowed an extended wolf hunting season for the past five years
Answer:
D. The number of cattle ranchers decreased in the past five years
Explanation:
According to Jennifer M Schieltz and Daniel I Rubenstein (2016), "More than a quarter of earth's land surface is used for grazing domestic livestock." This has negative effects on availability of pasture for herbivorous wildlife such as the deer.
Increase in the number of cattle ranchers decreases the availability of pasture and vice versa.
Hence, the decrease in the number of cattle ranchers over the past five years led to an increase in the deer population due to a decrease in competition for pasture.
How would YOU define speed?
Answer:
Speed is a way of measuring how quickly something is moving or being done, or something moving fast. An example of speed is a car being driven 45 miles per hour. An example of speed is someone cleaning a room in 10 minutes.
Giwe two Escample of translucent
Object
Answer: Butter paper, ground glass, and a bonus thin sheets of plastic
Explanation: Translucent objects allow light to pass through them partially.
Answer:
Tinted windows, frosted glass, sunglasses, wax paper, fingers, and certain plastics are all examples of translucent objects. Translucent is defined as a material that blurs light as it passes through.
Hope this helps :)
PLEASE HELP ME!!!
Which of the following connect to the energy conversions that happen when you plug a vacuum into an electrical outlet and turn it on?
A.)kinetic, chemical, sound
B.)sound, nuclear, electrical
C.)chemical, nuclear, electrical
D.)sound, thermal, kinetic
Answer:
I think is B. sound, nuclear, electrical
but if I wrong then I am so sorry
a 0.11kg moving hockey puck is caught by a 80kg goalie who then slides on the frictionless ice at 0.076 m/s. What was the initial velocity of the hockey puck
Answer:
55mph
Explanation:
a 0.11kg moving hockey puck is caught by a 80kg goalie who then slides on the frictionless ice at 0.076 m/s. the initial velocity of the hockey puck was 55mph
what is velocity ?Velocity is a parameter which can be defined as the rate at which the object change the position with respect to time, basically speeding the object in a specific direction.
It is a vector quantity which shows both magnitude and direction and The SI unit of velocity is meter per second (ms-1). the change in magnitude or the direction of velocity of a body, then it is said to be accelerated.
Finding the total velocity is simple but few calculations and basic conceptual knowledge are needed.
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A truck heading east has an initial velocity of 6 m/s. It accelerates at 2 m/s2 for 12 seconds. What distance does the truck travel in the given time?
84 m
144 m
216 m
360 m
The answer (distance) is:
216mThe distance of the truck in the given time is 216 m.
How do you find displacement with velocity and acceleration?
Displacement (s) of an object equals, velocity (u) times time (t), plus ½ times acceleration (a) times time squared (t2). Use standard gravity, a = 9.80665 m/s2, for equations involving the Earth's gravitational force as the acceleration rate of an object.
How do you find velocity from acceleration?
Multiply the acceleration by time to obtain the velocity change: velocity change = 6.95 * 4 = 27.8 m/s . Since the initial velocity was zero, the final velocity is equal to the change in speed. You can convert units to km/h by multiplying the result by 3.6: 27.8 * 3.6 ≈ 100 km/h.
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an object near the surface of a planet falls 54m in 3s. what is the acceleration due to gravity on that planet
Answer:
12s
Explanation:
how does light spectra help us understand astronomy
Answer: From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star.
Explanation: The spectral line also can tell us about any magnetic field of the star. The light from the stuff between the stars allows astronomers to study the interstellar medium.
Hope this helps! :)
What is the wavelength of a wave?
Definition: Wavelength can be defined as the distance between two successive crests or troughs of a wave.
PLEASE HELP :) <3
Describe some ways people can reduce the risks of being harmed by volcanoes and/or earthquakes.
Protection in a volcanic ashfall:
Stay inside, if possible, with windows and doors closed.
Wear long-sleeved shirts and long pants.
Use goggles to protect your eyes.
Keep your car or truck engine switched off.
Protection from earthquake if you're indoors:
Drop down and take cover under a desk or table
Stay inside until the shaking stops and it is safe to exit.
Stay away from bookcases and other furniture that can fall on you.
Stay away from windows and light fixtures.
If you are in bed – hold on and stay there.
Answer:
best way is to remain inside ur home or under any table
What is one difference between an electromagnetic wave and a mechanical wave?
A.
A mechanical wave can travel through a vacuum. An electromagnetic wave must have a medium to travel through.
B.
An electromagnetic wave can travel through a vacuum. A mechanical wave must have a medium to travel through.
C.
An electromagnetic wave moves parallel to the direction of the wave's travel. A mechanical wave can move only perpendicular to the direction of the wave's travel.
D.
An electromagnetic wave moves perpendicular to the direction of the wave's travel. A mechanical wave can move only parallel to the direction of the wave's travel.
A cannonball is launched off a 100 m cliff horizontally with an initial velocity of 50 m/s. The goal is to have the cannonball travel a target distance of 400m. Based on this, will the cannonball reach the target distance?
A. Yes, the cannonball will hit its goal
B. More information is needed to determine the outcome
C. No, the cannonball will overshoot its goal
D. No, the cannonball will fall short of the goal
self note *9
Answer:
D. No, the cannonball will fall short of the goal
Explanation:
Based on the information given in the problem, No, the cannonball will fall short of the goal, therefore the correct answer is option D.
What are the three equations of motion?There are three equations of motion given by Newton,
v = u + at
S = ut + 1/2×a×t²
v² - u² = 2×a×s
As given in the problem a cannonball is launched off a 100 m cliff horizontally with an initial velocity of 50 m/s. The goal is to have the cannonball travel a target distance of 400 meters,
By using the second equation of motion in the vertical direction,
100 = ut + 0.5*9.81*t²
t = 4.51 seconds
The distance traveled by the cannonball in the horizontal direction at the same time = 4.51*50
=205 meters
Thus, based on the information given in the problem, No, the cannonball will fall short of the goal, therefore the correct answer is option D.
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PLZ HELP!
The image here shows four soccer balls at four different locations on an uneven soccer field very near sea level. Which soccer ball has the greatest amount of potential energy?
Ball B
Ball C
Ball A
Ball D
Answer:
The answer is B.
Explanation:
Because that's the one that's more-so higher up than the other soccer balls. This grants the ball to have higher potential energy than the rest.
Quote:
"Your body is as weak as your soul, so it is easy to separate the two."
- Akuma
The ball b would have the greatest amount of the potential energy as the mass of each ball is the same then the ball on the highest altitude would have the greatest amount of the potential energy contained with it.
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.
The mechanical energy = potential energy + kinetic energy
As given in the problem, the image here shows four soccer balls at four different locations on an uneven soccer field very near sea level.
The potential energy of the ball = mass×gravity×height
Since each ball's mass is the same, the ball at the highest altitude would have the most potential energy within it. As a result, ball b would have the greatest quantity of potential energy.
Thus,the correct answer is option A.
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Five 6 ohm resistors are connected in parallel. Which of the following is their effective resistance?
A. 6 ohm
B. 1.2 ohm
C. 30 ohm
D. 5/6 ohm
1/Rt = 1/R1 + 1/R2 + 1/R3+ 1/R4+ 1/R5
1/Rt = 1/6+ 1/6+1/6+1/6+1/6
1/Rt = 5/6
Rt = 6/5
Rt = 1.2 ohm
so B is the answer
Lily takes 3 hours to travel from place A to place B at the rate of 60 miles per hour . She takes 2 hours to travel from B to c with50% increased speed .find the average speed from place A to C
Answer:
The average speed form A to C is 72 miles/hour
Explanation:
Average Speed
If an object travels a distance d in a time t regardless of the direction, the average speed is the quotient of the distance over the time:
[tex]\displaystyle \bar v=\frac{d}{t}[/tex]
Lily travels from A to C in two steps:
First, she takes ta=3 hours from A to B at va=60 miles/hour. The distance traveled in that time is:
da=va*ta
da=3*60 = 180
da = 180 miles
Then she takes tb=2 hours to travel from B to C at a speed 50% increased with respect to va, thus:
vb=150*va/100=1.5*60=90
vb=90 miles/hour
She travels a distance:
db=2*90=180 miles
The total distance traveled is
dt=180 + 180 = 360 miles
And the total time taken is
tt= 3 + 2 = 5 hours
Thus, the average speed is:
[tex]\displaystyle \bar v=\frac{dt}{tt}[/tex]
[tex]\displaystyle \bar v=\frac{360}{5}[/tex]
[tex]\displaystyle \bar v=72\ miles/hour[/tex]
The average speed form A to C is 72 miles/hour
The distance is 10 meters. What is the variable?
I shoot a water balloon catapult at the end of the year rally with a velocity of
57m/s at 31 degrees. What velocity does it hit the ground with?
Answer:
29.36 [tex]m/s[/tex] downwards
Explanation:
Use the equation [tex]v^{2} =u^{2} +2as[/tex]
Choose upwards as positive
v=?
u= 57sin31 (vertical component of initial velocity)
a= -9.8
s=0
[tex]v^{2} = (57sin31)^2 +2(-9.8)(0)[/tex]
v=29.36 [tex]m/s[/tex] downwards
During a phase change, a substance undergoes a(n) *
HELP
reversible change from one state to another.
irreversible change to a different substance
irreversible change from one state to another.
reversible change to a different substance.
Answer:
Reversible change from one state to another
Hope this helps
:)
The diagram shows a hand reaching for a doorknob.
Which action would decrease the strength of the electric force between the hand and the doorknob?
A) moving the hand closer to the doorknob
B) moving the hand farther away from the doorknob
C) adding negative charges to the hand
D) magnetizing the doorknob
Answer: Moving the hand farther away from the door knob
Explanation:
The magnetic force becomes weaker when there is more distance
The magnetic force becomes weaker when there is more distance.
What is Electric force?The nucleus and electrons are drawn to one another by the electric force. The void created by a positive or negative charge is referred to as an electric field since it generates a field there.
If you had a positive charge just here, it would have an electric field surrounding it and affect the area in which it was located.
The same applies for a negative charge; it too has an electric field surrounding it. Now, opposite charges attract each other while like charges repel one another. A positive charge here and a positive charge here, for example, would resist one another since they are similar charges.
Therefore, The magnetic force becomes weaker when there is more distance.
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why the formation of sand is a physical change.
A fish is swimming around the 720-meter perimeter of her pond. If she swims 10 laps in 120 minutes, what is her average speed in m/min
Answer:
60
Explanation:
what are contact force and non contact force give example
Explanation:
Force is push or pull on a body.
Contact force is a force that requires contact. It acts between two body that touches on another.
Examples are pushing a car, ringing a bell, kicking a ball.
Non contact forces are forces applied to another object without contact. The action of this force is usually through a targeted force field.
Examples are magnetic force, gravitational force