Which does not represent a change in velocity?Group of answer choices
A person is riding a bicycle at 4 m/s west and decreases her speed to 3 m/s.
A plane is flying south at 600 km/h and then flies directly upwards before returning to the airport.
A balloon is floating up into the air at 1 m/s.
A bus is traveling west at 2 m/s and then turns a corner.
Answers
Answer:
A balloon is floating up into the air at 1 m/s.
Explanation:
Velocity is the displacement divided by the time;
Velocity =
It is a vector quantity that has magnitude and direction.
The choice that shows a change in direction is a correct specification of velocity.
A balloon floating up into the air at 1m/s shows no directional change.
Related Questions
A worker pulls horizontally on a crate across a rough horizontal surface, causing it to move forward with constant velocity. Force A is the force exerted by the worker and force B is the force of friction due to the surface. What is the relationship between A and B?A > BA = BA< BIt will not slow down, but continue moving at constant velocity.
What was the rule of the sticks on each atom model
A 9.0 volt battery is connected to four resistors in a parallel circuit. The resistors have 7.0 Ω, 5.0 Ω, 4.0 Ω, and 2.0 Ω respectively. What is the total current in the circuit?
Every charged particle produces ?
Answers
Answer
1.2245 s
Explanation
Using the Newton's law of linear motion,
v = u + gt
where v ⇒ Final velocity
u ⇒ initial velocity,
t ⇒ time to reach maximum height.
g ⇒ acceleration due to gravity.
v = u + at
v = 0 m/s
g = -9.8 m/s² (negative because the velocity is decreasing)
0 = 6 + -9.8t
9.8t = 6
t = 0.612244898 s
This is the time to reach maximum height. It will take the same time to come back to the hand.
so total time = 0.612244898 × 2
= 1.2245 s
b. It has a fixed volume and shape.
c. It has high energy and expands to fill the container.
d. It has a fixed volume and varied shape.
Answers
She can measure the volume and mass of the marble, the volume and mass of the water, and the volume and mass of the graduated cylinder.
She can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder.
She can measure the volume of the marble and water, and the mass of the graduated cylinder.
She can measure the mass of the marble and water, and the volume of the graduated cylinder.
Answers
Answer:
Its B. She can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the graduated cylinder.
Explanation:
I just did it
Answer:
The awnser is actually B.
Explanation:
She can measure the mass of the water, marble and the graduated cylinder with the balance.
The volume of the water can be shown on the marked graduated cylinder, the volume of the marble can be measured by the volume difference of the water before and after the marble is put in.
Answers
the diagonal of the car, at 5m/s, that speed is relative to the floor of the car.
The reason I have to assume that is because I think it makes the problem
easier. I could be wrong. And it's still troubling, because 5 m/s is a hefty
11.18 mph, which is a pretty energetic walk. (In fact, it's a 5min 22sec mile,
which I for one never accomplished, even when I was running.) But so be it.
-- The length of the car's diagonal is √(3² + 15²) = √(9 + 225) = √334
-- The angle of his walk along the diagonal is the angle whose tangent is 3/15.
-- His velocity consists of the components [ 5 cos(angle) east ] and
[ 5 sin(angle) north ].
That's [ 5 x 15/√334 east ] and [ 5 x 3/√334 ] north .
The train's motion adds to the easterly component of his velocity,
and that becomes [ (2.5) + (5 x 15/√334) ] . The train's motion has
no effect on the northerly component of his velocity.
So now we're ready to put the components together and find his velocity
relative to the tracks. I think it'll be easier to go ahead and get the numerical
value of each component, and then combine them.
Easterly component: (2.5) + (5 x 15/√334) = 6.6038 m/s
Northerly component: 5 x 3/√334 = 0.8208 m/s
Just before finding the magnitude, we note that the direction of his velocity
is (the angle whose tangent is 0.8208/6.6038) north of east. That's about
7.085 degrees north of east ...the compass bearing of 82.92 degrees.
Now for the magnitude. It's the square root of the sum of the squares of
the easterly component and the northerly component.
√ (6.6038² + 0.8208²) = √44.2841 = 6.655 m/s
(All numbers are rounded.)
That's my story, and I'm sticking with it.
Answers
Answers
Importanceofozonelayer:
- The ozone shields the surface of the earth from ultraviolet UV radiation from the sun.
- These radiations are highly damaging as they can cause cancer in both plants and animals, damage to eyes and immune system.
- They can also lead to variations in global rainfall, ecological disturbances and dwingling of global food suppliers.
Explanation:
Formationofozonelayer:ozone at the higher level of the atmosphere is a product of UV radiations acting on oxygen O2 molecule. The higher energy UV radiations split apart some molecular oxygen( O2) into free oxygen (O) atoms.
Depletionodozonelayer:The amount of ozone in the atmosphere began to drop sharply in the 1980's . This decrease has been linked to synthetic chemicals like cholorofluorocarbons ( CFC's ) which are used as refrigerants and in fire extinguishers.