Answer: hair
Explanation: Since a persons hair can be tracked back to their DNA this was often used because most of the criminals were female and all female have extremely long hair. Hair is also easy to find at a crime scene because the k9 dogs can easily smell it.
Answer:
The answer to this question would be fingerprints.
Explanation:
In the late 1800's Chinese organized a fingerprinting system and started using it to track down criminals
Which two options are forms of potential energy
A nuclear energy
B chemical energy
C sound energy
D thermal energy
E electrical energy
Answer:
e and b
Explanation:
Answer:
D,E
Explanation:
thats what I would say because PE is the energy stored in an object
2. (01.02)
Choose the best definition for the following phrase: like terms (1 point)
Options:
A Letter that holds the place for some unknown value in mathematics.
A process where you must look for terms that have identical variable parts and then combine their coefficient
A process where if two things are equal, one can be put in the place of the other and nothing will change
Terms that have identical variable parts
Answer:
A process where you must look for terms that have identical variable parts and then combine their coefficient.
A group of students prepare for a robotic competition and build a robot that can launch large spheres of mass M in the horizontal direction with variable speed and from a variable vertical position and a fixed horizontal position x=0.
The robot is calibrated by adjusting the speed at which the sphere is launched and the height of the robot’s sphere launcher. Depending on where the spheres land on the ground, students earn points based on the accuracy of the robot. The robot is calibrated so that when the spheres are launched from a vertical position y=H and speed v0, they consistently land on the ground on a target that is at a position x=D. Positive directions for vector quantities are indicated in the figure.
When the students arrive at the competition, it is determined that the height of the sphere launcher can no longer be adjusted due to a mechanical malfunction. Therefore, the spheres must be launched at a vertical position of y=H2. However, the spheres may be launched at speed v0 or 2v0.
Question: In a clear response that may also contain diagrams and/or equations, describe which speed, v0 or 2v0, the students should launch the sphere at so that they earn the maximum number of points in the competition.
Answer:
[tex]V_0[/tex]
Explanation:
Given that, the range covered by the sphere, [tex]M[/tex], when released by the robot from the height, [tex]H[/tex], with the horizontal speed [tex]V_0[/tex] is [tex]D[/tex] as shown in the figure.
The initial velocity in the vertical direction is [tex]0[/tex].
Let [tex]g[/tex] be the acceleration due to gravity, which always acts vertically downwards, so, it will not change the horizontal direction of the speed, i.e. [tex]V_0[/tex] will remain constant throughout the projectile motion.
So, if the time of flight is [tex]t[/tex], then
[tex]D=V_0t\; \cdots (i)[/tex]
Now, from the equation of motion
[tex]s=ut+\frac 1 2 at^2\;\cdots (ii)[/tex]
Where [tex]s[/tex] is the displacement is the direction of force, [tex]u[/tex] is the initial velocity, [tex]a[/tex] is the constant acceleration and [tex]t[/tex] is time.
Here, [tex]s= -H, u=0,[/tex] and [tex]a=-g[/tex] (negative sign is for taking the sigh convention positive in [tex]+y[/tex] direction as shown in the figure.)
So, from equation (ii),
[tex]-H=0\times t +\frac 1 2 (-g)t^2[/tex]
[tex]\Rightarrow H=\frac 1 2 gt^2[/tex]
[tex]\Rightarrow t=\sqrt {\frac {2H}{g}}\;\cdots (iii)[/tex]
Similarly, for the launched height [tex]2H[/tex], the new time of flight, [tex]t'[/tex], is
[tex]t'=\sqrt {\frac {4H}{g}}[/tex]
From equation (iii), we have
[tex]\Rightarrow t'=\sqrt 2 t\;\cdots (iv)[/tex]
Now, the spheres may be launched at speed [tex]V_0[/tex] or [tex]2V_0[/tex].
Let, the distance covered in the [tex]x-[/tex]direction be [tex]D_1[/tex] for [tex]V_0[/tex] and [tex]D_2[/tex] for [tex]2V_0[/tex], we have
[tex]D_1=V_0t'[/tex]
[tex]D_1=V_0\times \sqrt 2 t[/tex] [from equation (iv)]
[tex]\Rightarrow D_1=\sqrt 2 D[/tex] [from equation (i)]
[tex]\Rightarrow D_1=1.41 D[/tex] (approximately)
This is in the [tex]3[/tex] points range as given in the figure.
Similarly, [tex]D_2=2V_0t'[/tex]
[tex]D_2=2V_0\times \sqrt 2 t[/tex] [from equation (iv)]
[tex]\Rightarrow D_2=2\sqrt 2 D[/tex] [from equation (i)]
[tex]\Rightarrow D_2=2.82 D[/tex] (approximately)
This is out of range, so there is no point for [tex]2V_0[/tex].
Hence, students must choose the speed [tex]V_0[/tex] to launch the sphere to get the maximum number of points.
Free fall motion is motion in which the only force acting on the body is gravity
The student should launch the sphere at 2·v₀, for the sphere will land at approximately 1.41·D, which is in the 3 point zone
The given parameter are;
The distance covered by the sphere when launched at height, H = D
The velocity with which the ball reaches D = v₀
The current available height of launcher= H/2
The available velocities = v₀, and 2·v₀
Solution:
From H = u·t + (1/2)·g·t², where, initial velocity of the vertical motion of the ball, u = 0 we have;
H = (1/2)·g·t²
∴ The time it takes the ball to drop from H, t = √(2·H/g)
The distance, D = v₀ × √(2·H/g)
When the height is H/2, we get;
t = √(2·H/(2·g)) = √(H/g)
The distance covered, D₁ = v₀ × √(H/g)
Therefore, D = (√2) × v₀ × √(H/g) = (√(2))·D₁
D₁ = D/(√2) ≈ 0.71·D
D₁ ≈ 0.71·D
At speed 2·v₀, we have;
D₂ = 2·v₀ × √(H/g) = √2 × v2 × v₀ × √(H/g) = √2 × v₀ × √(2·H/g) = √2·D₁ ≈ 1.41·D
D₂ ≈ 1.41·D
The 2 point zone = D/2 < x < D = 0.5·D < x < D (Position D₁ ≈ 0.71·D is located here)
The 3 Point Zone = D < x < 3·D/2 = D < x < 1.5·D (Position D₂ ≈ 1.41·D is located here)
Given that at D₂, the ball lands in the 3 Point Zone, the student should launch the sphere at the speed, 2·v₀, so that the ball will land at D₂ ≈ 1.41·D, which is in the 3 Point Zone
Learn more about free fall motion here:
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Janon walked 6m to the right, and 3m to the left, and then 4m to the right. What is
displacement? rs
(1 Point)
13 m
3 m
7 m
7 m right
Answer:
7 m
Explanation:
They began walking 6 meters to the right, so +6.
Then 3 meters left so -3,
And then 4 meters to the right again so +4.
4+6-3=7 meters
An electric car is being driven through a town at 22 m/s. The kinetic energy of the car is 222640 J. Calculate the mass of the car
Answer:
920 kg
Explanation:
[tex]kinetic \: energy = 222640j \\ \frac{1}{2} mv {}^{2} = 222640 \\ \frac{1}{2} m(22) {}^{2} = 222640 \\ m = 920kg[/tex]
A baseball is hit so that it travels straight upward after being struck by the bat. A fan observes that it takes 3.00 s for the ball to reach its maximum height. Find (a) the ball’s initial velocity and (b) the maximum height it reaches.
Answer:
initial velocity is0m/s and final velocity is29.4m/s
A car slows from 90mi/he to 55mi/hr when it sees the police what's the cars acceleration
PLEASE HEEELLLPPPP What is the difference between a hypothesis and a theory? A hypothesis is a testable statement, and a theory is well-supported explanation. A hypothesis is a theory that has been proven. A hypothesis is a law of nature, and a theory is always true. A hypothesis is an observation that can turn into a theory.
Answer:
A hypothesis is a testable statement, and a theory is well-supported explanation.
234 cm …. ________________ meters
Answer:
the answer is 234 cm is 2.34 meters
2. A ball is released from a vertical height of 20 cm. It rolls down a "perfectly
frictionless" ramp and up a similar ramp. What vertical height on the second
ramp will the ball reach before it starts to roll back down?
Answer:
20 cm
Explanation:
Given that a ball is released from a vertical height of 20 cm. It rolls down a "perfectly frictionless" ramp and up a similar ramp. What vertical height on the second ramp will the ball reach before it starts to roll back down?
Since it is perfectly frictionless, the Kinetic energy in which the ball is rolling will be equal to the potential energy at the edge of the ramp.
Therefore, the ball will reach 20 cm before it starts to roll back down.
HEY CAN ANYONE PLS PLS PLS HELP ME OUT IN DIS I AM STRUGGLING TOO MUCH
=======================================================
Work Shown:
r = radius = 1.045 cm
h = height = 30.48 cm
pi = 3.141 approximately
V = volume of cylinder
V = pi*r^2*h
V = 3.141*(1.045)^2*30.48
V = 104.547940002
V = 104.5 cubic cm
A car drives 10km with a speed of 72 km/hr and then runs out of gas. Then you walk 2km for the next 30 min
until you find a gas station.
Given :
A car drives 10 km with a speed of 72 km/hr and then runs out of gas.
Then you walk 2 km for the next 30 min until you find a gas station .
To Find :
The average speed of whole journey .
Solution :
Average speed is given by :
[tex]v_{avg}=\dfrac{\text{Total distance covered}}{\text{Total time taken}}\\\\v_{avg}=\dfrac{10+2}{\dfrac{10}{72}+\dfrac{1}{2}}\\\\\\v_{avg}=18.78\ km/hr[/tex]
Hence , this is the required solution .
What is the location for the valence electron(s) for an atom of Barium, Ba?
O 2 electrons in energy level 3
O 2 electrons in energy level 6
O 6 electrons in energy level 2
O 1 valence electron in energy level 6
Answer:
2 electrons in energy level 6
Sal sprinted 40 m to the right in 5.5s what is his average velocity
Answer: 7.27 m/s
Explanation:
Is sound potential or kinetic energy
Answer:
Sound energy (that is, mechanical vibrational waves passing through an elastic medium) is a combination of kinetic and potential energies. As the wave compresses the medium (storing elastic potential energy) the medium comes to rest (no motion so no kinetic energy).
Explanation:
Hope this helps :D
To win the game, a place kicker must kick a
football from a point 52 m (56.8672 yd) from
the goal, and the ball must clear the crossbar,
which is 3.05 m high. When kicked, the ball
leaves the ground with a speed of 26 m/s at
an angle of 31.5◦ from the horizontal. The acceleration of gravity is 9.8 m/s2.
By how much vertical distance does the ball clear the crossbar?
Answer in units of m.
Answer:
1.86 m
Explanation:
First, find the time it takes to travel the horizontal distance. Given:
Δx = 52 m
v₀ = 26 m/s cos 31.5° ≈ 22.2 m/s
a = 0 m/s²
Find: t
Δx = v₀ t + ½ at²
52 m = (22.2 m/s) t + ½ (0 m/s²) t²
t = 2.35 s
Next, find the vertical displacement. Given:
v₀ = 26 m/s sin 31.5° ≈ 13.6 m/s
a = -9.8 m/s²
t = 2.35 s
Find: Δy
Δy = v₀ t + ½ at²
Δy = (13.6 m/s) (2.35 s) + ½ (-9.8 m/s²) (2.35 s)²
Δy = 4.91 m
The distance between the ball and the crossbar is:
4.91 m − 3.05 m = 1.86 m
If you needed to measure the length of a room, you should use the unit
Answer:
meters, yards or feet
Explanation:
25 POINTS! ANSWER CORRECTLY FOR BRAINLIEST!
Which of these is a type of climate?
A. Foggy
B. Overcast
C. Thunderous
D. Tropical
(I honestly think its foggy but I want other peoples opinions)
Answer:
d. tropical
Explanation:
Tropical climates are characterized by constant high temperatures
What type of energy is stored in chemical bonds of molecules ?
Answer:
potential energy,
Explanation:
Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy.
The energy stored on the chemical bonds of molecules is chemical energy. When the chemical bonds are broken, the energy is released.
What is chemical energy?Chemical energy is a form of energy which is stored in the form of chemical bonds. There are various other forms of energy such as electrical energy, mechanical energy, kinetic energy etc.
There are different types of chemical bonds such as ionic bonds, covalent bonds, metallic bonds etc. Each type of bond are of different bond strength and energy.
Molecules are formed by the combination of atoms through chemical bonding. Chemical energy is stored within the bonds and this energy releases when the bond breaks.
To find more on chemical energy, refer here:
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PLEASE HELP!!!!!!!!!!!!!!!!!!!!!
Calculate the distance the gecko covers when sprinting from rest to 2 m/s in a time of 1.5 s.
Answer:
1.5 m
Explanation:
a = v/t
a = 2/1,5 = 4/3
x = 1/2 a t² + vt + x
x = 1/2 × 4/3 × 9/4 = 3/2 = 1.5 m
A textbook is dropped from a second floor window and falls to the ground. What happens to the acceleration as the book falls to the ground
-the acceleration increases
-the acceleration decreases
-the acceleration remains constant *
Answer:
The correct option is;
The acceleration remains constant
Explanation:
The acceleration is due to the force of gravitational attraction between the text book and the Earth
According to Newton's law of gravitation, there is an attractive force between all objects given by the following relation;
F = G×M₁×m₂/r²
Where;
G, M₁, m₂, and r are constant such that we have;
G×M₁/r² = Constant = The acceleraton due to gravity, g
F = g×m₂
So the acceleration of the textbook as it is being attracted by the force of gravity towards the ground (Earth) is remains constant.
PLEASE HELP ME I APPRECIATE IT WILL GIVE BRAINLIEST
(Write a paragraph) What are the similarities and differences between these volcanoes:
Composite Volcano, Lava Dome, Shield Volcano, and Cinder Cone.
Answer:
Explanation:
Composite volcanoes, also called stratovolcanoes, are cone-shaped volcanoes built from many layers of lava, pumice, ash, and tephra. A lava dome is a circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano. A shield volcano is a type of volcano usually composed almost entirely of fluid lava flows. It is named for its low profile, resembling a warrior's shield lying on the ground. A cinder cone is a steep conical hill of loose pyroclastic fragments, such as either volcanic clinkers, volcanic ash, or cinder that has been built around a volcanic vent.
An astronaut holds a rock 100m above the surface of Planet XX. The rock is then thrown upward with a speed of 15m/s, as shown in the figure. The rock reaches the ground 10s after it is thrown. The atmosphere of Planet XX has a negligible effect on the rock when it is in free fall. Determine the acceleration due to gravity of the rock when it is on Planet XX.
Answer:
Explanation:
Using the equation of motion to get the acceleration due to gravoty of the rock on the planet.
S = ut+ 1/2at² where;
S is the distance of the rock above the surface of the planet = 100m
u is the initial velocity = 15m/s
a is the acceleration due to gravity
t is the time taken by the rock to reach the ground = 10s
Since the rock is thrown upward the acceleration due to gravity will be negative i.e a= -g
The equation becomes S = ut- 1/2gt²
Substituting the given value to get the time t
100 = 15(10)- 1/2g(10)²
100 = 150-50g
100-150 = -50g
-50 = -50g
g = -50/-50
g = 1m/s²
Hence the acceleration due to gravity of the rock when it is on Planet XX is 1m/s²
A soccer ball is kicked horizontally. What is the average speed if its distance is 21.0 m after 4.00 s?
the acceleration due to gravity on earth is 9.8 m/s^2. The force acting on an object on earth is 22 newtons. What is the mass of this object on earth?
Explanation:
solution ,
[tex]a = 9.8m \div {s}^{2} [/tex]
[tex]f = 22 \: newton[/tex]
[tex] M= \: ?[/tex]
Now,
f=Ma
or,
f/a=M
or,
22/9.8=M
or,
2•24=M
or,
M=2.24kg
Charlotte throws a paper airplane into the air, and it lands on the ground. Which best explains why this is an example of projectile motion?
A). The paper airplane’s motion is due to horizontal inertia and the vertical pull of gravity.
B). A force other than gravity is acting on the paper airplane.
C). The paper airplane’s motion can be described using only one dimension.
D). A push and a pull are the primary forces acting on the paper airplane.
Explanation:
yes it is the force that is subjected by the force of gravity onlyAnswer:
A. The paper airplane’s motion is due to horizontal inertia and the vertical pull of gravity.
Explanation:
Got it right on edge.
An airplane flies 250.0 km at 300 m/s. How long does this take?
Which SI units would you use for the following measurements?.
Answer:
Where are the measurements?
Explanation:
We can measure the length of the swimming pool by using the SI unit meter, as the length of the swimming pool comes under the fundamental measurement of the dimension which is measured by the standardized international unit of length.
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
There are three additional units and 7 SI basic units in this system of SI units, the base SI units are meter, kilogram, second, kelvin, ampere, candela, and mole.
As given in the problem we have to find how can we measure the length of the swimming pool,
Due to the fact that the length of the swimming pool falls under the category of a dimension that is fundamentally measured using a standardized international unit of length.
Thus, we can measure the length of the swimming pool by using the SI unit meter,
Learn more about the unit of measurement from here,
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Your question seems incomplete the complete question is,
Which SI units would you use for the following measurements?
the length of a swimming pool
A plane's average speed between two cities is 625 km/hr. If the trip takes 2.5 hours, how far does the plane fly?
Answer: 1,562.5 Km
Explanation: If it takes one hour to travel 625 kilometers, then, in two and a half hours, you should travel 1,562.5 Kilometers because of 625x2.5=1562.5 kilometers
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U'll get pts too
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