Answer:
evaporation
Explanation:
Which type of wave is not reflected by the ionosphere?
Answer:
skip zone
Explanation:
From Earth stars appear very dim, but in space they are quite bright. From Earth we are seeing the stars
A) absolute magnitude
B) apparent magnitude
C) available magnitude
D) absent magnitude
Answer:
B
Explanation:
Which energy source was developed through the invention of the atomic bomb?
Answer:
Nuclear energy
Explanation:
A projectile is launched with an initial velocity of v⃗ =(4m/s)x^+(3m/s)y^. What is the velocity of the projectile when it reaches its highest point?
Answer:
4m/sExplanation
Give the initial velocity of am object as v =(4m/s)xi+(3m/s)yj
From the expression;
Vy = 3m/s
Vx = 4m/s
At the maximum height, the velocity of the body is zero i.e Vy = 0m/s
The velocity of the projectile as it reaches its highest point will be:
v = (4m/s)xi + 0
v = √4²+0²
v = √16
v = 4m/s
Hence he velocity of the projectile when it reaches its highest point is 4m/s
how does the initial velocity affect the final velocity
Answer:
Initial velocity is independent of the slope of the graph; that is, the acceleration. An object thrown downward still accelerates after release at the same rate as an object that is dropped.
A downed pilot fires a flare from a flare gun. The flare an initial speed of 250 m/s and is fired at an angle of 35° to the ground. Find the maximum height the flare will reach. How long does it take for the flare to reach its maximum altitude ? What will be the final vertical velocity ?
Answer:
Maximum Altitude: vi = 250 m/s At the maximum height q = 35° vy,f = vy,i − g∆t = 0 g = 9.81 m/s2 vy,i = vi (sin q) = g∆t ∆t = vi (si g n q) = (250 9 m .8 / 1 s) m (s / i s n 2 35°) ∆t = 15 s
Vertical Velocity: Vyf = 439.09
Explanation:
The time it will take to reach its maximum altitude will be 14.63 seconds, and the final vertical velocity will be 143.4 m/s.
What is Speed?Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, speed is a scalar value, but velocity is a vector.
The velocity at time t = 0 is known as the initial velocity (u). It is the rate at which motion initially manifests itself.
On the other hand, the final velocity is a vector number that represents the speed and direction of a moving body after it has experienced its maximum acceleration.
According to the question, the given values are :
Angle, θ = 35°
V₀ = 250 m/s
[tex]V_o_y=V_osin\theta[/tex]
[tex]V_o_y[/tex] = (250)(sin 35°)
= 250 × 0.573
[tex]V_o_y[/tex] = 143.4 m/s.
Now, the time it will take to reach its maximum height will be :
[tex]t_m_a_x=V_o_y/g[/tex]
= 143.4 / 9.8
[tex]t_m_a_x[/tex]= 14.63 seconds.
Hence, the time it will take to reach its maximum altitude is 14.63 seconds.
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in an electrically neutral atom
Answer:
A proton and an electron have an equal amount but an opposite type of charge. Thus, if an atom contains equal numbers of protons and electrons, the atom is described as being electrically neutral
Answer:
Explanation:
Atoms are electrically neutral because they contain equal quantities of positively charged protons and negatively charged electrons. Electrons and protons have equal but opposite charges, so the result is no net charge. Ions are atoms that have gained or lost electrons. As a result, ions have a net charge.
When the air resistance can be ignored the velocity of an object dropped initially from rest is given by following equation where g is free fall acceleration
g*t^2/2
g*t
g*t/2
g
Answer:
v = gt
Explanation:
From the question given, we obtained the following information:
Initial velocity (u) = 0 m/s
Acceleration due to gravity (g) = g
Time (t) = t
Final velocity (v) =.?
Thus, we can obtain the velocity as illustrated below:
v = u + gt
v = 0 + gt
v = gt
Thus, the equation for the velocity is
v = gt
A jet airliner moving initially at 693 mph (with respect to the ground) to the east moves into a region where the wind is blowing at 798 mph in a direction 37◦ north of east. What is the new speed of the aircraft with respect to the ground? Answer in units of mph.
Answer:
The new speed of the aircraft with respect to the ground is 1414.3 mph.
Explanation:
Given that,
Angle = 37°
Velocity of jet airliner = 693 mph
Velocity of wind = 798 mph
We know that,
The new velocity of the aircraft with respect to the ground
[tex]v=v_{a}+v_{w}[/tex]
We need to calculate the new speed of the aircraft with respect to the ground
Using formula for velocity
[tex]v=\sqrt{(v_{a})^2+(v_{w})^2+2v_{a}v_{w}\cos\theta}[/tex]
Put the value into the formula
[tex]v=\sqrt{(693)^2+(798)^2+2\times693\times798\cos37}[/tex]
[tex]v=1414.3\ mph[/tex]
Hence, The new speed of the aircraft with respect to the ground is 1414.3 mph.
Define weight
Please help!!Thanks!!
Answer:
in science and engineering , the weight of an object is the force acting on the object due to gravity.
My Exit Ticket
The color of the Sun is more orange and red at sunrise and sunset and more yellow at noon. What is the main
factor that causes the change in color?
the scattering of short wavelengths as light
passes through the atmosphere
the change in the amount of the sunlight's
energy
the chabge in density in the atmosphere
the change in temperature in the
atmosphere
Windows
< Check My
e
Answer:
the scattering of short wavelengths as light
passes through the atmosphere
A wooden box is pushed with 100 N towards North
direction, and from the opposite side another 100 N is
applied towards South direction. What is the net force?
convert 9.2 km to m
Answer:
9,200 m
Explanation:
1 kilometer = 1000 meters so if there is 9 kilometers then it is 9000 meters, then .2 kilometer is equal to 200 meters. Add the numbers together to get 9,200 meters
Which of the three objects is the largest? Explain your answer.
Answer:
isn't it the first one
Answer:
The object in figure C is a planet, so it is the largest object. Planets are larger than comets and asteroids.
Explanation:
What must an object have in order to exert a gravitational field?
Answer:
power
Explanation:
how many bags of pineapples did joey buy if he bought 8 pineapples. each bag holds three pineapples.
Answer:
3 BagsExplanation:
1) Since the bags hold three pineapples
2) we can also hold two pineapples in one bag.
Hope this helps! <3
Brady connected the lose wire to the battery and created an electromagnet as shown below. He picked up 45 thumb tacks with his electromagnet, though his goal was to pick up 50 thumb tacks. What could Brady do to increase the strength of his electromagnet and pick up more thumbtacks?
Answer:
He will have to use two batteries instead of just one.
Explanation:
The way Brady could increase the strength of his electromagnet and pick up more thumbtacks is for him to increase the current. He can achieve this either by adding a second battery or by adding more coils of wire.
This is because using 2 batteries will make the amount of current in the coils to increase and this will in turn produce a higher electromagnetic field in the nail.
HURRY PLEASE!!!
Which of the following demonstrates the result of waves traveling at
different speeds when moving from one medium to another?
A. The absence of any sound in outer space
B. The bending of light as it moves from air to water
C. The movement of ocean currents as the earth rotates
D. The up and down motion of a collided metal spring
Answer:
B.
Explanation:
The one that demonstrate the result of waves traveling at different speeds when moving from one medium to another is the bending of light as it moves from air to water. The correct option is B.
What is bending of light?Even though waves travel at different speeds through different mediums, light bends or is refracted as it travels from one medium to another.
The degree to which it bends is referred to as the index of refraction. Light bends more as the index of refraction increases.
The change in direction of waves that occurs when they travel from one medium to another is referred to as refraction.
Refraction is always accompanied by a change in wavelength and speed. The bending of waves around obstacles and openings is known as diffraction.
The bending of light as it moves from air to water is an example of the result of waves traveling at different speeds when moving from one medium to another.
Thus, the correct option is B.
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find the mass of a football player who's momentum is 630 kg•m/s backward and. is traveling at 7 m/s.
Answer:
The answer is 90 kgExplanation:
In order to find the mass of the football we use the formula
[tex]m = \frac{p}{v} \\ [/tex]
where
p is the momentum
v is the velocity
We have
[tex]m = \frac{630}{7} \\ [/tex]
We have the final answer as
90 kgHope this helps you
7. Which of the following is created when an
enclosed fluid is squeezed?
A. buoyancy
B. convection
st
C. pressure
D. gravity
Answer:
Pressure
Explanation:
the answer is pressure
Pete the Penguin loves to sled down his favorite hill. If he hits a speed of
50 m/s after 5 seconds, what is his rate of acceleration? Hint: He starts at
O m/s at the top of the hill.
Answer:
10 m/per second
Explanation:
he speeds up 10 m in a single second
When a car's velocity is positive and its acceleration is negative, what is happening to the car's motion?
-the car slows down
-The car speeds up.
-The car travels at constant speed.
-The car remains at rest.
Answer:
Assuming rightward is positive, the velocity is positive whenever the car is moving to the right, and the velocity is negative whenever the car is moving to the left. The acceleration points in the same direction as the velocity if the car is speeding up, and in the opposite direction if the car is slowing down.
Explanation:
9. A coin rolls off the edge of a table that is 89 meters above the floor and lands 2.88 meters from the bottom o
the table
A. How much time is the coin in the air?
Answer:
0.43 seconds
Explanation:
The bowler threw the 9kg bowling ball with a force
of 90N. What was the bowling ball's acceleration?
Answer:
10 m/s²
Explanation:
9kg= mass 90N=force acceleration=?
the equation is;
Acceleration (m/s²)= force(N) ÷ mass(kg)
The density of gold is 19.3gm/ml . Express it's value in SI
Explanation:
Troy ounce 1 32.15075
Gram 31.1034768 1000
Kilogram 0.03110348 1
Tola (South Asia) 2.6666675 85.73535
Answer the following:
You are going to race your friend to a tree near the back of the playground. The tree is 24 meters away from where you stand. It will take you 4 seconds to reach the tree. What will your average speed be?
Answer:
1. 6 m/s.
2. 320 miles.
Explanation:
1. Determination of the average speed.
Total distance travelled (D) = 24 m
Total time (t) = 4 s
Average speed =.?
Average speed is simply defined:
Average speed = Total distance /total time
Average speed = 24/4
Average speed = 6 m/s
2. Determination of the distance travelled by the train.
Speed = 40 mph
Time = 8 h
Distance =?
Speed is simply defined as:
Speed = Distance /time
40 = Distance / 8
Cross multiply
Distance = 40 × 8
Distance = 320 miles
Therefore, the train travels a distance of 320 miles.
I don't want the answer i just need help on figuring out how to solve this!
Jose Altuve hits a fastball with a velocity of 49.1 m/s (109.9 mph) at an angle of 22º. If left field is 96 m (315 ft) away, will this be a home run?
Answer:
Yes, it will be a Home Run
Explanation:
(Note : It is assumed that the collision between bat and ball is perfectly elastic.)
( Also I don't know anything about baseball, so I checked the dimensions online, which are minimum 325 ft (left and right field foul pole) and minimum 400 ft centre field fence)).
STEP 1
Find Horizontal Range of Projectile
[tex]R = \frac{ {u}^{2} \sin(2 \alpha ) }{g} = \frac{(49.1)^{2} \sin(44°) }{g}[/tex]
[tex]R = 170.8 \: m \: = 560.3 \: ft[/tex]
Therefore, the ball will travel 560.3 ft horizontally well beyond 400 ft (largest dimension of the field), and it'll be a Home Run.
Tech A says that some electric actuators are positioned by an A/C ECU which checks the air flow with sensors. Tech B says that electric actuators are positioned by an A/C ECU and some actuators have a potentiometer to tell the A/C ECU the position of the door. Who is correct?
Answer:
Tech B
Explanation:
The control of electric actuators may be through through a two-wire or a five-wire circuit through the driver circuit by bidirectionally controlling via the motor wire polarity. The door position is determined by counting the actuator commutator pulses by the control module in the actuator with 2-wire, while the actuator with 5-wire uses potentiometer feedback.
The A/C ECU is the Air Condition Engine Control Unit.
A ball is thrown vertically upward with an initial velocity of 29.4 m/s². What is the maximum height reached by the ball? How long is the ball in the air? What is the final velocity of the ball before it goes back to its original position?
Answer:
Most likely it will reach 29.4 up in the air before coming back down.
Explanation:
The force of the ball will be the same on how high it will go.
Given 1 inch ≡ 2.54 cm and 1 foot ≡
12 inches, how many square centimeters are
in 3.22 ft2
?
Answer:
2991.47 [cm^2]
Explanation:
To solve this problem we must perform a dimensional analysis and use the corresponding conversion values:
[tex]3.22[ft^{2}]*\frac{12^{2}in^{2} }{1^{2}ft^{2}} *\frac{2.54^{2}cm^{2} }{1^{2}in^{2} } \\2991.47[cm^{2}][/tex]