which best describes the difference between speed and velocity? A) velocity is instantaneous ,B) speed is a vector quantity

Freight trains can produce only relatively small acceleration and decelerations. (a) what is the final velocity (in m/s) of a fr

m_a_m_a [10]

(a) We will use the equation v = u + at
Initial velocity u = 5.00 m/s
Acceleration a = 0.0600 m/s²
time = 8 min = 8 x 60 = 480 s
Final velocity
= u + at
= 5.00 + 0.0600(480)
= 33.8 m/s

The final velocity is 33.8 m/s

5 0

3 years ago

Read 2 more answers

Which of the following statements is true

kirill115 [55]

There are no true statements on that list.

6 0

4 years ago

Drag the tiles to the correct boxes to complete the pairs.

zhannawk [14.2K]

This is the match:

1) stored energy related to positions of atoms within molecules ↔ chemical energy

Explanation: the chemical energy is the energy stored in the bonds that binds the atoms that form the molecules.

2) energy released when a nucleus splits or combines ↔ nuclear energy

Explanation: there is a huge energy inside an atom which may be released when nuclei suffer fusion (combination of nuclei) or fission (split of nuclei). The fusion of atoms is what happens in stars and it is the source of their energy. Fision of atoms is the nuclear energy used in the nuclear plants to produce electricity.

3) energy related to an object's movement ↔ motion energy

Explanation:

The motion energy is the kinetic energy, KE. KE = (1/2) m* v^2

4) energy related to heigth ↔ gravitaional potential energy

The higher an object is the higher its gravitational potential energy, PE.

PE = m*g*h.

5) energy related by vibration of a string ↔ sound energy

Explanation:

Sure you have seen that: when the string of a guitar vibrate the sound is produced.

6) energy of motion of particles in a substance ↔ thermal energy

The thermal energy is the product of the motions (vibration, translation and collisions) of the molecules that form the substance. The higher the motion the the higher the thermal energy measured as temperature.

4 0

4 years ago

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A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket

NARA [144]

The constant acceleration of a rocket launched upward, calculated knowing that the time it takes for a bolt that falls off the side of the rocker was 6.30 seconds, is 5.68 m/s².

When the rocket is launched straight up with constant acceleration, the acceleration of the rocket is given by:

$v_{f_{r}} = v_{i_{r}} + at$

Where:

$v_{f_{r}}$ : is the final velocity of the rocket

$v_{i_{r}}$ : is the initial velocity of the rocket = 0

a: is the acceleration

t: is the time

After 4 seconds, the final speed of the rocket will be the initial speed of the bolt, so:

$v_{f_{r}} = v_{i_{b}} = at = 4a$

When the bolt falls off the side of the rocket, the bolt hits the ground 6.30 seconds later.

The initial height of the bolt will be the final height of the rocket, and vice-versa. With this, we can take the final height of the bolt as zero.

$y_{f_{b}} = y_{i_{b}} + v_{i_{b}}t - \frac{1}{2}gt^{2}$

$0 = y_{i_{b}} + v_{i_{b}}t - \frac{1}{2}gt^{2}$

$y_{i_{b}} = \frac{1}{2}9.81*(6.30)^{2} - 4a*6.30 = 194.7 - 25.2a$

Now, as we said above, this height (of the bolt) will be the final height of the rocket, so:

$y_{f_{r}} = y_{i_{r}} + v_{i_{r}}t - \frac{1}{2}gt^{2}$

$194.7 - 25.2a = 0 + 0 - \frac{1}{2}a(4)^{2}$

$a = \frac{194.7}{33.2} = 5.86 m/s^{2}$

Therefore, the acceleration of the rocket is 5.68 m/s².

You can find another example of acceleration calculation here: brainly.com/question/24589208?referrer=searchResults

I hope it helps you!

3 0

3 years ago

Which states of matter have four substances

Black_prince [1.1K]

Answer:

Four states of matter are observable in everyday life: solid, liquid, gas, and plasma.

Explanation:

4 0

4 years ago