Answer:
Approximately [tex]-15.37m/s^2[/tex]
Explanation:
The acceleration can be found using the formula:
[tex]x_{f} = x_{i} + v_{i} (t)+\frac{1}{2} (a)(t^{2} )[/tex]
The work is as shown:
[tex]45m = 0 + 39 m/s (3.3s)+\frac{1}{2} a(3.3s)^2[/tex]
[tex]45m=128.7m + 5.445s^2 a[/tex]
[tex]-83.7m=5.445s^2a[/tex]
[tex]a = -15.37190083m/s^2[/tex]
a is about -15.37[tex]m/s^2[/tex]
An expensive carbon weave 5-spoke bike wheel has total mass M and radius R. If half the mass of the wheel is in the spokes, what is this wheel's moment of inertia?
Answer: I = [tex]\frac{11}{6}MR^{2}[/tex]
Explanation: Moment of Inertia (I) is the opposition on a rotating body. Generally, is calculated by [tex]I=2mr^{2}[/tex]
A bycicle wheel is composed of numerous parts and each part has its own moment of inertia.
Moment of inertia for this 5-spoke bike wheel will be:
Inertia of ring: [tex]I_{r}=m_{r}r^{2}[/tex]
For the 5-spoke wheel:
[tex]I_{r}=MR^{2}[/tex]
Inertia of spokes: [tex]I_{s}=\frac{1}{3}n.m_{s}r^{2}[/tex]
where
n is the number of spokes
For the 5-spoke wheel, half of the total mass is the spokes, then:
[tex]I_{s}=\frac{1}{3}.5. \frac{M}{2}R^{2}[/tex]
[tex]I_{s}=\frac{5}{6}MR^{2}[/tex]
Inertia of the wheel is the sum of both inertia:
[tex]I=I_{r}+I_{s}[/tex]
[tex]I=MR^{2}+\frac{5}{6}MR^{2}[/tex]
[tex]I=\frac{11}{6}MR^{2}[/tex]
The moment of inertia of the 5-spoke bike wheel is [tex]I=\frac{11}{6}MR^{2}[/tex]
A swimmer swims 20 m in 40 s. What is swimmer’s average speed?
Answer:
s = d/t = 20 m/40 s = 0.5 m/s
Explanation:
A swimmer swims a distance of 20 m in a time of 40 seconds, then the speed of the swimmer is 0.5 m/s.
What is Speed?The speed of an entity, which is a scalar quantity in regular usage and kinematics, can be defined as the size of the change in direction per unit time or the size of the change in position over time for an object. The initial speed is the upper limit of maximum pace as the duration of a time interval gets closer to zero.
The average pace of the object over an amount of time is computed by subtracting its distance traveled by the length of the interval. Velocity and speed are not the same.
As per the given data provided by the question,
Distance, d = 20 meters
Time, t = 40 seconds
Then average speed, s = d/t
s = 20/40
s = 0.5 m/s.
Therefore, the average speed of the swimmer is 0.5 m/s.
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Earth attracts apple from the tree and it falls on it but the earth does not move
towards the apple. Why?
Explanation:
Earth has gravity and a apple does not thats why the earth is not pulled by apples
ON YOUR OWN
Express the following in numerals. Remember to leave a space after
each period.
(a) Thirty-two thousand four hundred one
(b)Ninety thousand twelve
(c) Sixty-five thousand eight hundred ten
(d) One hundred thousand
Answer:
32401
92012
65810
100000
There are two possible angles, relative to the horizontal, that the ball could have been kicked. What is the smallest of those two angles
Answer:
The smallest of those two angles is 20°
Explanation:
Here , v = 30m/s
range = 59m
Range =[tex]\frac{u^2sin2\theta}{g}[/tex]
59 =[tex]\frac{30\times30\times sin2\theta}{9.8}[/tex]
[tex]sin2\theta=\frac{59\times9.8}{30\times30}[/tex]
[tex]2\theta=40[/tex]°
[tex]\theta=[/tex] 20° (since 90° -20°= 70°)
Therefore , the two angles are 20° and 70°
Among the both , the smallest angle is 20°
A projectile is fired horizontally with a velocity of 48 m/s from the hill 294 m high. Find the time taken to reach the ground.
A. 7.75 s
B. 10.0 s
C. 60.5 s
D. 15.2 s
Is stakeboarding a closed or open system? Pls help
Answer:
It is a closed system.
Explanation:
The nergy can be transferred, but matter cant be transferred. A skateboarder starts at the top of a long, steep incline. As they skate down the incline, they frequently angles the wheels to decelerate.
how do you perceive the importance of online safety security ethics and etiquette
Answer:
is called online etiquette, or netiquette for short.
...
Here are some tips to help you get started:
Create Complex Passwords.
Boost Your Network Security.
Use a Firewall.
Click Smart.
Be a Selective Sharer.
Protect Your Mobile Life.
Practice Safe Surfing & Shopping.
Keep up to date.
Describe how carbon and oxygen form carbon dioxide
enter your answer in the space provided
Answer:
Carbon and oxygen can integrate to form gases. whilst combustion of carbon is complete, i.e. inside the presence of masses of air, the product is particularly carbon dioxide.
Explanation:
your welcome
The heart has four one-way valves, which open and close with each heartbeat,
True
False
When an object moves with 2 dimensional motion, what happens to the vertical velocity?
Write the following numbers in standard notation:
a. 9 x 103
b. 7.7 x 10-5
c. 4.99 x 10-9
d. 2.25 x 1010
Answer:
23
Explanation:
Energy conversion in an electric circuit consisting of a battery and a load
is.............
A. Heat Energy→ Electrical Energy → Potential Energy
B. Potential Energ → Electrical Energy → Heat Energy
C. Electrical Energy → Potential Energy→ Chemical Energy
D. Potential Energy → Heat Energy→ Electrical Energy
please please please i need heeelp
Answer:
[tex]option \: c. \: is \: correct[/tex]
Explanation:
[tex]C. \\ Electrical \: Energy → Potential \: Energy→ Chemical \: Energy[/tex]
♨Rage♨
Answer:
B that is Potential Energy → Electrical Energy → Heat Energy because, the energy is always stored in the form of potential energy because it is not in static form, so in this case it is going to be in a form of CHEMICAL POTENTIAL ENERGY now when it is connected with the load, the energy stored in the battery will move in the form of electrical energy, now you should remember Electrical energy is a type of kinetic energy caused by moving electric charges, so if it says kinetic energy, you should it is talking about electrical energy. So finally the static electrical energy is converted in the form of heat energy. We could take the EXAMPLE of heater.
In the heater chemical potential energy is converted into Heat Energy.
If the amount of energy needed to operate a 100 W light bulb for one minute were used to launch a 2-kg projectile, what maximum height would the projectile reach, ignoring any resistive effects?
a. 20 m
b. 50 m
c. 100 m
d. 200 m
e. 300 m
Given that,
Power of the light bulb = 100 W
Mass of the projectile = 2 kg
Time, = 1 minute = 60 s
We need to find the maximum height that would the projectile reach. We know that the rate at which the work is done is called power. It can be given by the formula as follows :
[tex]P=\dfrac{W}{t}[/tex]
W is work done,
[tex]P=\dfrac{mgh}{t}[/tex]
h is maximum height reached
[tex]h=\dfrac{Pt}{mg}\\\\h=\dfrac{100\times 60}{2\times 9.8}\\\\h=306.12\ m[/tex]
So, the projectile will reach up to a height of 306.12 m.
WILL GIVE BRAINLIESTIn which of the following locations would most likely find parenchyma cells? Leaves roots flowers bark
What is the distance required to stop (i.e., braking distance) of a passenger car when brakes are applied on a 2% downgrade if that vehicle is traveling at 40 mph
Answer:
The value is [tex]d = 161 \ ft[/tex]
Explanation:
From the question we are told that
The gradient is G = 2% = 0.02
The initial speed of the vehicle is u = 40 mph
Generally the breaking speed is mathematically represented as
[tex]d = \frac{u^2}{30 [\frac{a}{g} - G ]}[/tex]
Here [tex]\frac{a}{g}[/tex] is equal to longitudinal friction coefficient which has a value of
[tex]\frac{a}{g} = 0.35[/tex]
So
[tex]d = \frac{40^2}{30 [0.35 - 0.02 ]}[/tex]
=> [tex]d = 161 \ ft[/tex]
When did Kentucky host its first national cluster meeting?
Answer:
1988
Explanation:
in Louisville
A car traveling north with a speed of 30miles per hours. How far did it go in 7 hours
The car traveling with a speed of 30 miles per hours will travel 210 miles in 7 hours.
What is Speed ?Speed is a rate of change of distance with respect to time. i.e. v=dx÷dt.
Speed can also be defined as distance over time
i.e. speed= distance ÷ time
it is denoted by v and its SI unit is m/s. it is a scalar quantity.
Speed shows how much distance can be traveled in unit time.
To find dimension for speed is,
from formula
Speed = Distance ÷ Time
Dimension for distance is [L¹] ,
Dimension for Time is [T¹],
Dividing dimension of distance by dimension of time gives,
[L¹] ÷ [T¹] = [L¹T⁻¹]
Dimension for speed is [L¹T⁻¹]
Given,
Speed = 30 miles per hr
Time = 7 hr
Distance = ?
Speed = Distance ÷ Time
Distance = Speed × Time
Distance = 30 × 7 = 210 miles
Hence car will go 210 miles in 7 hours.
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Two capacitors are identical except that one is filled with air and the other with oil. Both capacitors carry the same charge. The ratio of the electric fields Eair/Eoil is:
a. Between 0 and 1
b. 0
c. 1
d. Between 1 and infinity
d. None of these
Answer: d. Between 1 and infinity
Explanation:
The correct answer is Between 1 and infinity This is so because Eair/Eoil = Kair/koil.
Basically a capacitor is a device which is used or utilized in storing electricity in an electric field. They are found in electrical devices and appliances where they are used in applications.
4300 seconds is equal to:
a. 1 hour, 11 minutes, 40 seconds
b. 2 hours, 10 minutes, 0 seconds
c. 11 hours, 56 minutes, 40 seconds
d. 71 hours, 40 minutes, 0 seconds
Answer:
A
Explanation:
4300 ÷ 60 = 71.6666 minutes
60 mins = 1 hour
71.6666 - 60 = 11.6666
1 hour and 11 mins
Can you have a negative value on a distance time graph?
Answer:
I'm not quite sure, but i believe you should be able to
Explanation:
l
13. How much water will flow in one minute through 200mm of a tube 1.5mm in diameter if the pressure across the tube is 10 cmHg
Answer:
The volumetric flow rate is 0.00589 cm³ /s
Explanation:
Given;
length of the tube, L = 200 mm = 20 cm
diameter of the tube, 1.5 mm
radius of the tube, r = 0.75 mm = 0.075 cm
Area of the tube is given by;
A = πr²
A = π(0.075)² = 0.0177 cm²
Velocity of water through the tube is given is by;
v = L / t
v = 20 cm / 60 s
v = 0.333 cm / s
Volumetric flow rate of water is given by;
Q = Av
Q = (0.0177 cm²)(0.333 cm / s)
Q = 0.00589 cm³ /s
Therefore, the volumetric flow rate is 0.00589 cm³ /s
A person throws a shot put from height of 5 feet with an initial vertical velocity of 40 feet per second. Use the vertical motion model, h = -16t^2 + vt + s, where v is the initial velocity in feet per second and s is the initial height in feet, to calculate the amount of time the shot put is in the air before it hits the ground
Answer:
2.6
Explanation:
Suppose that the lab wiring is mistakenly designed so that all the stations are on the same 120Volt circuit. A circuit breaker allows a maximum of 40Amps to be drawn by the lab stations. If each lab station used 550watts or power how many lab stations can be running at once before the circuit breaker cuts off the power
Answer:
9 stations .
Explanation:
All the stations are connected in parallel .
volt at each station = 120 V .
power used at each stations = 550
power = volt x current
550 = 120 x current
current = 4.5833 A
maximum current allowed by circuit breaker = 40 A
no of lab stations possible = 40 / 4.5833
= 8.72 or 9 .
Two objects are moving in the x, y plane as shown. If a net torque of 44 N∙m acts on them for 5.0 seconds, what is the change in their angular momentum?
Answer:
190kg*m^2/sExplanation:
Torque can be defined as the rate of change of angular momentum
Step one:
We need to solve for the total angular momentum acting on them
the expression for the angular momentum is given as
L=mrv-----1
where
L=angular momentum
m=mass
v=velocity
r=radius
Step two:
For the first object
m=6kg
r=1m
v=2m/s
L1=6*1*2= 12kg*m^2/s
For the second object
m=3kg
r=2m
v=3m/s
L2=3*2*3= 18kg*m^2/s
Step three:
Total angular momentum= L1+L2= 12+18= 30kg*m^2/s
τ=44Nm
time= 5 secs
ΔL=τ*time
ΔL=44*5=220N-ms
hence the angular impulse=220Nms
Change in their angular momentum= Angular impulse-angular momentum
Change in their angular momentum= 220-30
Change in their angular momentum=190kg*m^2/s
Which event is associated with convergent boundaries
A. Formation of island chains
B. Creation of mid-ocean ridges
C. Creation of convection currents
D. Formation of rift valleys
The even that is associated with convergent boundaries is formation of islands. The correct option is A.
What are convergent boundaries?A convergent boundary occurs whenever two plates come around each other.
The implications of colliding plates can cause one or both plates' edges to buckle up into mountain ranges, or one plate to bend down into a deep seafloor trench.
A chain of islands, also renowned as an archipelago, is a group of islands that are evenly distributed in lakes, oceans, and rivers inside a defined area. The Islands are connected by a convergent boundary.
The Mariana Islands and Japan are examples of island chains that share convergent boundaries.
Thus, here one can conclude that the event that is associated with convergent boundaries is the formation of Island chains means the option A is correct.
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Which statement best explains the pharaoh’s role in the economy?
The pharaoh only taxed the wealthy.
The pharaoh owned all land and wealth.
The pharaoh provided jobs in the kingdom.
The pharaoh oversaw all trade with other kingdoms.
Answer:
Owned all the land and wealth.
Answer:
The pharaoh owned all land and wealth.
Explanation:
pharaoh's were rulers in ancient Egypt so they were very rich.
What is the maximum torque on a 213-turn square loop of wire 18.0 cm on a side that carries a 65.0-A current in a 1.60-T field
Answer:
The maximum torque on the loop is 717.73 N.m
Explanation:
Given;
number of turns, N = 213 turns
side of the square loop, L = 18 cm = 0.18 m
current in the loop, I = 65 A
magnetic field though the loop, B = 1.6 T
Area of the loop, A = L² = (0.18 )² = 0.0324 m²
The maximum torque on the loop is given by;
τ = NBIA
Substitute the given values and solve for maximum torque (τ);
τ = (213)(1.6)(65)(0.0324)
τ = 717.73 N.m
Therefore, the maximum torque on the loop is 717.73 N.m
At its peak, a tornado is 73.0 m in diameter and carries 395-km/h winds. What is its angular velocity in revolutions per second
Answer:
The angular velocity of the tornado at its peak is 0.478 revolutions per second.
Explanation:
Let consider that tornado rotates at constant speed. From Rotation Physics we get the following relationship between linear ([tex]v[/tex]) and angular speeds ([tex]\omega[/tex]), measured in meter per second and radians per second, respectively.
[tex]\omega = \frac{v}{R}[/tex] (Eq. 1)
Where [tex]R[/tex] is the radius of the tornado, measured in meters.
If we know that [tex]v = 109.722\,\frac{m}{s}[/tex] and [tex]R = 36.5\,m[/tex], then the angular speed of the tornado at its peak is:
[tex]\omega = \frac{109.722\,\frac{m}{s} }{36.5\,m}[/tex]
[tex]\omega = 3.006\,\frac{rad}{s}[/tex] [tex]\left(0.478\,\frac{rev}{s} \right)[/tex]
The angular velocity of the tornado at its peak is 0.478 revolutions per second.
GUYS I NEED HELP WITH THIS
Answer:
The total kinetic energy must be greater than the momentum of either ball
Explanation:
In order to solve this problem, we must clarify the following conditions, the balls are in motion that is, there is kinetic energy, the kinetic energy is a scalar magnitude, therefore this energy is greater than zero.
But however momentum is equal to zero, momentum is a vector quantity, that is, these velocities have a direction, momentum is defined as the product of mass by Velocity.
P = m*v (momentum lineal)
where:
P = lineal momentum [kg*m/s]
m = mass [kg]
v = velocity [m/s]
Since the masses of the balls are equal, we have:
m1 = m2
therefore:
m1*v1 + (m2*v2) = 0 (total momentum)
For the sum to be equal to zero, besides the equivalation of the masses, the velocities must also be equal, but the velocities must be of opposite sign, to meet equality to zero.
m1*v1 - m2*v2 = 0
And the kinetic energy of a body is defined by means of the following equation
Ek = 0.5*m*v²
Since the magnitude of the velocities is greater than zero, so that there is movement, we can say that the kinetic energy is much greater than zero, as well as greater than the total linear momentum