Answer:
Final speed of security car v = 65 m/s
Explanation:
Given:
Speed of race car u1 = 35m/s
Speed of security car u2 = 5 m/s
Acceleration = 5 m/s²
Find:
Final speed of security car v
Computation:
Assume, they chase S meter
So
S = u1t + [1/2]at²
S = 35t
S = u2t + [1/2]at²
so,
35t = 5t + [1/2](5)t²
t = 12 s
So
v = u + at
v = 5 + 5(12)
Final speed of security car v = 65 m/s
A thermogram taken outside a house shows high amounts of thermal energy around the windows but not around the roof.
Which conclusion supports the thermogram?
The windows and the roof are energy efficient.
The windows and the roof are not energy efficient.
The windows are not energy efficient, but the roof is energy efficient.
The windows are energy efficient, but the roof is not energy efficient.
The conclusion supports the thermogram will be that the windows are not energy efficient, but the roof is energy efficient.
What is Thermography ?Thermography is a noninvasive method that employs an infrared camera to generate pictures that depict patterns of heat and blood flow on or near the body's surface.
A thermogram taken outside a house shows high amounts of thermal energy around the windows but not around the roof.
The conclusion supports the thermogram will be that the windows are not energy efficient, but the roof is energy efficient.
Hence option c is correct.
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If you dont want to read all of that it is option C
A bus starts to move from rest. If it is accelerated by 0.8m/s2, calculate the velocity and distance traveled after 8 s.
We are given:_______________________________________________
Initial velocity (u) = 0 m/s
acceleration (a) = 0.8 m/s²
time interval (t) = 8 seconds
final velocity (v) = v m/s
distance travelled (s) = s m
Solving for the final velocity:___________________________________
We know that:
v = u + at [first equation of motion]
v = 0 + (0.8)(8) [replacing the variables]
v = 6.4 m/s
Hence, the final velocity is 6.4 m/s
Solving for the distance travelled:_______________________________
We know that:
s = ut + 1/2(at²) [second equation of motion]
s = (0)(8) + 1/2(0.8)(8)(8) [replacing the variables]
s = 1/2(6.4*8)
s = 25.6 m
Hence, the distance travelled is 25.6 m
a car drives at a velocity of 12 [m/s] for 9 [s]. what distance does the car drive?
Answer:
The car drives 108 m
why does a fast working machine possess more power? Clarify your answer
Plz help by answering
Power can be defined as the rate at which energy is converted per unit time
and the formula is given below
Power = Force × Velocity
In a machine, there are series of energy conversion which takes place to
ensure work is done to achieve a goal. When the machine works fast, the
energy conversion increases with time.
The increase in energy conversion depicts that more work is done and the
machine has more power.
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The amount of current flowing through a conducting material when 360C charge flows for 3min
Answer:
Amount of current (I) = 2 Amperes
Explanation:
Given:
Coulomb charge = 360 C
Time = 3 min = 3 x 60 sec = 180 sec
Find:
Amount of current
Computation:
Amount of current (I) = Coulomb charge / Time
Amount of current (I) = 360 / 180
Amount of current (I) = 2 Amperes
Who do you think the target market of these advertisements is? Explain.
Answer:
uhhhhhhh wait what
Explanation:
What advertisement
If a moving body of mass 100g has kinetic energy 45 joules, what will be it's velocity?
Answer:
[tex]\boxed{\pink{\sf Velocity \ of \ the \ body \ is \ 30m/s .}}[/tex]
Explanation:
Given that a body is moving which has a mass of 100g. And its Kinetic energy is 45 Joules . We need to find its velocity . So ,
[tex]\boxed{\red{\bf Kinetic\: Energy =\dfrac{1}{2}mv^2 }}[/tex]
Now here mass is in grams. So converting it into SI units we have , 100/1000 kg = 0.1 kg
[tex]\implies KE =\dfrac{1}{2}mv^2 \\\\\implies 45 J = \dfrac{1}{2}\times \dfrac{1}{10} kg \times v^2 \\\\\implies v^2 = 45 \times 20 \\\\\implies v^2 = 900 m^2/s^2 \\\\\implies v =\sqrt{900 m^2/s^2} \\\\\underline{\boxed{\blue{\tt \implies Velocity = 30m/s }}}[/tex]
The figure below shows a 2 kg box. A 10 N force pushes the box horizontally across a level flat surface. The frictional force that results from contact with the surface produces a 2 N force that opposes the direction of the box's movement. image What is the net force acting on the box?
A. 5 N, right
B. 8 N, right
C. 20 N, right
D. 12 N, right
Fricition opposes the pushing force, so the net force is
10 N - 2 N = 8 N
to the right.
What is the squirrels escape velocity in mph if the squirrel accelerates at a constant 1.5 m/s squared from rest for 2.5s
Answer:
3.75 m/s
Explanation:
From the question given above, the following data were obtained:
Acceleration (a) = 1.5 m/s²
Initial velocity (u) = 0 m/s
Time (t) = 2.5 s
Final velocity (v) =?
a = (v – u) / t
1.5 = (v – 0) / 2.5
1.5 = v / 2.5
Cross multiply
v = 1.5 × 2.5
v = 3.75 m/s
Hence, the escape velocity of the squirrel is 3.75 m/s
A student of 4 feet tall went for swimming in a pool. He saw the depth of water in the pole less than 4 feet .Will he sink , write with reason
Answer:
he will not be drowned
Explanation:
Question says , the height of the student = 4 feet,
Depth of the pool( in feet ) be x ( say ) which is less than 4 feet,
Clearly, the depth of the pool < height of the student,
This means, if the student goes for swimming in the pool, however he does not know swimming, he will not be drowned until he is suffering from an injury or external force.
Distinguish between heat and work in terms of energy
Answer:
Heat is the energy associated with the random motion of particles, while work is the energy of ordered motion in one direction. Therefore heat is "low-quality" energy and work is "high-quality" energy, and this supports the entropy statement of the Second Law.
Explanation:
Madeline fires a bullet horizontally. The rifle is 1.9 meters above the ground. The bullet travels 200 meters horizontally before it hits the ground. What speed did Madeline's bullet have when it exited the rifle?
Answer:
322.6 m/s
Explanation:
Given that there are two components of position;
x= vot
y component is;
y= 1.9 - gt^2/2
When the bullet hits the ground, y=0
1.9 -gt^2/2 =0
Where g = 10ms^-2
t= √2 × 1.9/10
t= 0.62 secs
Therefore,
x= vot
vo = x/t
Where, x= 200 m
vo= 200/0.62 =
vo= 322.6 m/s
1. A truck with a mass of 8, 000 kg is traveling at 26.8 m/s when it hits the brakes. A.)What is the momentum of the truck before it hits the brakes?
B.)The truck comes to a stop, losing all of that momentum. It takes 12.4 s for the truck to come to a
complete stop. How much force does it take to stop the truck?
Answer:
1. A.) The moment of the truck before it hits the brakes is 214,400 kg·m/s
B.) The force it takes to stop the truck is approximately 17,290.4 N
Explanation:
1. A.) The given parameters are;
The mass of the truck, m = 8,000 kg
The velocity of the truck when it hits the brakes, u = 26.8 m/s
Momentum = Mass × Velocity
The moment of the truck = The mass of the truck × The velocity of the truck
Therefore;
The moment of the truck before it hits the brakes = 8,000 kg × 26.8 m/s = 214,400 kg·m/s
B.) The amount of momentum lost when the truck comes to a stop = The initial momentum of the truck
The time it takes the truck to come to a complete stop, t = 12.4 s
The deceleration, "a" of the truck is given by the following kinematic equation of motion
v = u - a·t
Where;
v = The final velocity of the truck = 0 m/s
u = The initial velocity = 26.8 m/s
a = the deceleration of the truck
t = The time of deceleration of the truck = 12.4 s
Substituting the known values gives;
0 = 26.8 - a × 12.4
Therefore;
26.8 = a × 12.4
a = 26.8/12.4 ≈ 2.1613
The deceleration (negative acceleration) of the truck, a ≈ 2.1613 m/s²
Force = Mass × Acceleration
The force required to stop the truck = The mass pf the truck × The deceleration (negative acceleration) given to the truck
∴ The force it takes to stop the truck = 8,000 kg × 2.1613 m/s² ≈ 17,290.4 N.
A car moves with a speed of 72 km/h for 15 minutes and then with a speed of 80 km/h for the next 12 minutes. The total distance covered by the car is:
Answer:
The total distance covered by the car is 3,810.08 m
Explanation:
Given;
initial speed of the car, u = 72 km/hr = 20 m/s
initial time, t₁ = 15 minutes = 900 s
final speed of the car, v = 80 km/hr = 22.22 m/s
final time, t₂ = 12 minutes = 720 s
The acceleration of the car is given as;
[tex]a = \frac{v-u}{t_2 -t_1} \\\\a = \frac{22.22-20}{900-720}\\\\a = 0.0123 \ m/s^2[/tex]
The total distance covered by the car is given as;
v² = u² + 2as
where;
s is the total distance covered by the car
22.22² = 20² + 2(0.0123)s
22.22² - 20² = 2(0.0123)s
93.728 = 0.0246s
s = 93.728 / 0.0246
s = 3,810.08 m
Therefore, the total distance covered by the car is 3,810.08 m
Answer:
34 km
Explanation:
Remark
You are dealing with distance not direction. So you just figure out the two parts separately and add.
15 minutes
t = 15 minutes * 1 hour / 60 minutes = 0.25 hours.
r = 72 km / hr
d = 72 km / hr * 0.25 hours
d = 18 km
12 minutes
t = 12 minutes * 1 hour/ 60 minutes = 0.2 hours
r = 80 km/hour
d = 80 * 0.2 = 16 km
Total distance
d = d1 + d2
d = 18 + 16 = 34 km
An object falls from a high building. Ignoring air resistance, what will its velocity be after 6 seconds of falling
Explanation:
Vf=Vi+at
reference frame,take down as positive in y- axis
Data
Vi=0m/s
Vf=?
a=g(9.8m/s2)
t=6s
Vf=0+9.8m/s2*6s
Vf=58.8m/s
The velocity of the object after falling for 6 s from a high building is 58.8 m/s
From the question given above, the following data were obtained:Initial velocity (u) = 0 m/s
Time (t) = 6 s
Acceleration due to gravity (g) = 9.8 m/s²
Final velocity (v) =?The velocity of the object after falling for 6 s can be obtained as follow:v = u + gtv = 0 + (9.8 × 6)
v = 0 + 58.8
v = 58.8 m/sTherefore, the velocity of the object after falling for 6 s is 58.8 m/s
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When a force of 2.4 newtons is applied to a spring, the extension is 0.4 m. What is the spring constant?
6 N/m
9.6 N/m
2 N/m
2.4 N/m
Answer:
6N/m
Explanation:
k = Fe
f = 2.4
e = 0.4
2.4 ÷ 0.4
= 6N/m
can someone please explain some calculations on vernier calliper
Answer:
Hey mate here's your answer ⤵️
Vernier caliper least counts formula is calculated by dividing the smallest reading of the main scale with the total number of divisions of the vernier scale.LC of vernier caliper is the difference between one smallest reading of the main scale and one smallest reading of vernier scale which is 0.1 mm 0r 0.01 cm
Hope it was helpfulllwrite a summary of Albert Einstein accomplishments
Answer:
He is also known for his discovery of the photoelectric effect, for which he won the Nobel Prize for Physics in 1921. Einstein developed a theory of special and general relativity, which helped to complicate and expand upon theories that had been put forth by Isaac Newton over 200 years prior.
answer :-He is also known for his discovery of the photoelectric effect, for which he won the Nobel Prize for Physics in 1921. Einstein developed a theory of special and general relativity, which helped to complicate and expand upon theories that had been put forth by Isaac Newton over 200 years prior.
Why are drills performed in drum beats
Answer:
The drum drill is just one option in stride frequency development. Most of the time, the drum drill can be seen as just a rhythm drill that allows an athlete to relax and experiment with the right range of motion and bounce. A solid background in floating drills and developing reactivity should help athletes mold their stride into a balanced motion that maximizes their speed.
I have used frequency drills for years and now understand the nature of stride development mainly from shaping the stride parameters we all have known about for a long time. The drum drill is a special exercise that can make a great change in athletes who are receptive to improving and with a coach who is worth their salt in instruction. The drum drill is just one option for improving an athlete, and it’s more than fine to use any method you see fit that helps improve stride frequency.
Explanation:
Explanation:
Most of the time, the drum drill can be seen as just a rhythm drill that allows an athlete to relax and experiment with the right range of motion and bounce. A solid background in floating drills and developing reactivity should help athletes mold their stride into a balanced motion that maximizes their speed
We break down a UK drill beat, a genre that rapidly became one of the ... Beat Dissected is a regular series in which we deconstruct drum patterns, ... an 808 bass line with plenty of glides and a piano played back in halftime.
1 A student says that current is the amount of charge. Is he correct? Explain your answer.
Answer:
No he's not correct. Current is the rate of flow of charge. 1 Ampere is the amount of 1 coulomb of charge that flows per second. 10 Ampere would then be 10 coulomb of charge flowing in one second.
What is the speed of sound in a medium with a wavelength of 340 m and a
frequency of 2.5 Hz?
Explanation:
Speed
= Wavelength * Frequency
= 340m * 2.5Hz
= 850m/s
Okay I need help with this question.....-_-
When does an object have no kinetic energy
P.S I need the answer ASAP
Answer:
A
Explanation:
an object has no kinetic energy when its at rest
___ is the rate of change of velocity of an object? Formula: ___
Answer:
Acceleration is the rate of change of velocity of an object.
Formula: Had to take a picture of the formula
Answer:
Acceleration is the rate of change of velocity of an object.
Formula:
[tex]a=\frac{v-v_{0} }{t}[/tex]
The formula is basically the change in velocity over the time
a is the acceleration
v is the final velocity
v0 is the starting/initial velocity
t is the time elapsed
Hope this helps :)
give two differences between mass and weight
Answer: 1) Mass is a scalar quantity while weight is a vector quantity
2) Mass is measured in Gramma and kilogram while weight is measured in Newton.
Explanation:
Mass can be defined as the amount of matter that comprises an object. It is a scalar quantity, that is, it has magnitude. It is measured in kilogram with its unit in Kg. Mass is measured using an ordinary weighing scale.
Weight can be defined as the force acted upon an object due to gravity. Weight is a vector quantity, that is, it has both magnitude and direction towards the center of the earth. Weight can be measured with the use of a spring balance. Its unit is in Newton.
A puck moves 2.35 m/s in a
-22.0° direction. A hockey stick pushes it for 0.215 s, changing its velocity to 6.42 m/s in a 50.0° direction. What was the magnitude of the acceleration?
Answer:
28.4
Explanation:
for those on acellus
The acceleration of the puck is the rate of change in velocity of the puck. The acceleration is obtained as 9.06 m/s².
What is acceleration?Acceleration of an object is its rate of change in velocity. It is a vector quantity, thus, having both magnitude and direction.
The velocity components is given
2.35 m/s in direction of 22° and 6.42 m/s in a direction of 50°.
Thus, initial velocity u = 2.35 cos 22 = 2.17 m/s
final velocity V = 6.42 cos 50 = 4.12 m/s
Hence, the change in velocity = V - U
= 4.12 - 2.17 = 1.95 m/s.
The time change is given ΔT = 0.215 s.
ΔV = 1.95 m/s
Thus, acceleration = ΔV / ΔT
= 1.95 m/s / 0.215 s
= 9.06 m/s².
Therefore, the acceleration of the puck is 9.06 m/s².
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Find the volume and area of a spherical body of radius 49cm.
Explanation:
Area of sphere:4
[tex]4\pir {}^{2} [/tex]
4×3.14×49^2
=30156.56
volume of sphere:
[tex]4 \div 3pir {}^{3} [/tex]
4/3×3.14×49^3
492434.00
not sure
Which element would Element X most likely be grouped with on the periodic table?
Answer:
group 0
Explanation:
it might be xenon (Xe)
According to the electronic configuration, and assuming the element to be halogen it is most likely to be grouped with potassium as halogens are in need of one electron which is easily made available by potassium.
What is electronic configuration ?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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The frictional force exerted by the road on the body is
Answer:
Explanation:
Frictional force can be defined as the force that is generated by two surfaces which are in contact with each other and even goes ahead to slide against each other. It can also be simply defined as a force that oppose the sliding of one object over the other
There are different types of frictional forces such as dry friction, lubricated friction, internal friction, fluid friction etc. One of the factors that affects frictional forces is that the forces are majorly affected by the surface texture and amount of force that bounds them together.
6. Find the acceleration of a 25kg crate man pushing it with 45N force?
Answer:
1.8m/s2
Explanation:
force=mass x acceleration
so,
acceleration=force /mass
=45/25
=1.8
HELP If a skater has a mass of 55 kg and the maximum height the skater can reach is 10 m, then what will be the velocity of the skater if they skate down to a height of 5 m?
please if someone could explain this to me, that'd be appreciated :)
Hello, for this applicate formula:
Vf² = Vo² + 2gh
Data:
Vf = Final Velocity = ¿?
Vo = Initial veloctiy = 0 m/s
g = Gravity = 9,81 m/s²
h = Height = 5 m
Replacing according our data:
Vf² = 0 m/s² + 2(9,81 m/s²)(5 m)
Vf² = 98,1 m²/s²
Vf = √98,1 m²/s²
Vf = 9,9 m/s
The final velocity will be 9,9 meters per second.
The answer is 9.9 m/s