Answer:
the law that the velocity of recession of distant galaxies from our own is proportional to their distance from us.
Explanation:
Hubble's law, also known as the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from the Earth at speeds proportional to their distance. In other words, the farther they are the faster they are moving away from Earth.
The compass of an airplane indicates that the airplane is heading north. The airplane is moving at an airspeed of 230 km/h. The wind is blowing east at 55 km/h.
1.What is the speed of the plane with respect to the ground?
2.How many degrees east of north is the plane’s velocity with respect to the ground?
Answer:
Explanation:
airspeed is speed with respect to air .
Let speed of airplane with respect to ground be V .
wind is blowing east at 55 km/h
airplane is heading north with speed V
Resultant of V and 55 km /h is 230 km/h
V² + 55² = 230²
V² = 52900 - 3025
V = 223.32 km/h
Let θ be the required angle
Tanθ = 55 / 223.32 = .246
θ = 14⁰ .
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:
Check all the answers that apply. Energy is the ability to
A. Change temperature
B. Change speed
C. Do work
D. Change direction
Answer:
D. Do work
Explanation:
Answer:
c: do work and b: change speed
Explanation:
Which in NOT a type of muscle?
a
Smooth
b
Flat
c
Cardiac
d
Skeletal
Answer:
flat lol, that's the answer
Compared with falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the
Answer: The question is incomplete, options are not given and here are the options from another website.
A. Carpeted floor provide small impulse.
B. stopping time is shorter on the carpet.
C. stopping time is longer on the carpet.
D. carpet provides a smaller impulse and a longer time.
The correct option is C.
A wine glass may not break when it falls on carpet floor because the stopping time on carpet floor is longer to that of stone floor.
Explanation:
A wine glass may not break when it falls on carpet floor because the stopping time on carpet floor is longer to that of stone floor because the change in glass momentum is the same for both stone and carpet flow, therefore the impulses that is supplied by both carpet and stone floor is the same. Therefore,there is longer stopping time by the carpet floor because there is smaller force that act on it compared to stone floor which lead to less damage.
When an object moves with 2 dimensional motion, what happens to the vertical velocity?
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 .
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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A 25.0-g object moving to the right at 20.0 cm/s overtakes and collides elastically with a 10.0-g object moving in the same direction at 15.0 cm/s. Find the velocity of each object after the collision.
Answer:
v₁ = 17.1 cm/s
v₂ = 22.1 cm/s
Explanation:
From the principle of linear momentum, the momentum is conserved
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
where m₁ = mass of first object = 25.0 g
u₁ = initial velocity of first object = 20 cm/s
m₂ = mass of second object = 10.0 g
u₂ = initial velocity of second object = 15.0 cm/s
v₁ = final velocity of first object
v₂ = final velocity of second object
25 * 20 + 10 * 15 = 25 * v₁ + 10 * v₂
650 = 25v₁ + 10v₂ ----(1)
Also in an elastic collision, Kinetic energy is conserved and sum of initial and final velocities is conserved
u₁ + v₁ = u₂ + v₂
20 + v₁ = 15 + v₂
v₂ = 5 + v₁
Substitute v₂ = 5 + v₁ in (1)
650 = 25v₁ + 10(5 + v₁)
90 = 25v₁ + 10v₁ + 50
35v₁ = 600
v₁ = 600/35
v₁ = 17.1 cm/s
Therefore, v₂ = 5 + 17.1 cm/s
v₂ = 22.1 cm/s
The motion with respect to the direction is called velocity. The change of velocity is known as acceleration.
According to the question. The value is as follows:-[tex]25 * 20 + 10 * 15 = 25 * v_{1} + 10 * v_{2}[/tex]
[tex]650 = 25v_{1} + 10v_{2} ----(1)[/tex]
Also in an elastic collision, Kinetic energy is conserved and the sum of initial and final velocities is conserved
[tex]u_{1} + v_{2} = u_{1} + v_{2}[/tex]
After putting the value:- [tex]20 + v_{1} = 15 + v_{2}[/tex]
Hence:- v₂ = 5 + v₁
After solving both the equation, the value of V will be
v₁ = [tex]\frac{600}{35}[/tex]
Hence the value of V is 17.1 cm/s
Therefore, v₂ = 5 + 17.1 cm/s
v₂ = 22.1 cm/s
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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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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
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
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
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
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
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]
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.
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
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:
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]
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.
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.
WILL GIVE BRAINLIESTIn which of the following locations would most likely find parenchyma cells? Leaves roots flowers bark
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.
When did Kentucky host its first national cluster meeting?
Answer:
1988
Explanation:
in Louisville
Newton's law of restitution
Answer:
Explanation:
Newton's law of restitution states that when two bodies collide, the speed with which they move after the collision actually depends on the material from which they are made. The Coefficient of Restitution (e) tells us about the bounciness, or elasticity, of the collision.
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
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.
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
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
