Physics, 30.12.2019 22:31 damariush567

A2.0-kg block is attached to one end of a spring with a spring constant of 100 n/m and a 4.0-kg block is attached to the other end. the blocks are placed on a horizontal frictionless surface and set into motion. at one instant the 2.0-kg block is observed to be traveling to the right with a speed of 0.50 m/s and the 4.0-kg block is observed to be traveling to the left with a speed of 0.30 m/s. since the only forces on the blocks are the force of gravity, the normal force of the surface, and the force of the spring, we conclude tha

Answers: 2

Show answers

Answers

Answer from: nataliahenderso

The complete question is:

A 2.0-kg block is attached to one end of a spring with a spring constant of 100 N/m and a 4.0-kg block is attached to the other end. The blocks are placed on a horizontal frictionless surface and set into motion. At one instant the 2.0-kg block is observed to be traveling to the right with a speed of 0.50 m/s and the 4.0-kg block is observed to be traveling to the left with a speed of 0.30 m/s. Since the only forces on the blocks are the force of gravity, the normal force of the surface, and the force of the spring, we conclude that: A) the spring is compressed at the time of the observation B) the spring is not compressed at the time of observation C) the motion was started with the masses at rest D) the motion was started with at least one of masses moving E) the motion was started by compressing the spring.

D) The motion was started with at least one of masses moving.

Explanation:

A) the spring is compressed at the time of the observation

This situation is not true because if the spring is compressed, both the blocks will move with equal velocity.

B) the spring is not compressed at the time of observation

This situation is not true because if the spring is not compressed then the blocks will be in equilibrium position and in static position.

C) the motion was started with the masses at rest

This situation is not true because the blocks will then move either with same velocity or the blocks will be in static position.

E) the motion was started by compressing the spring

This situation is not true because the blocks will then move with same velocity since, both blocks are tied with the same string.

D) the motion was started with at least one of masses moving

This situation is true since, both the blocks are moving in opposite direction i.e. 2 kg block is moving in right direction and 4 kg block is moving in left direction so, in this situation:

m1 = 2 kg

m2 = 4 kg

v1 = 0.5 m/s

v2 = -0.3 m/s (because 4 kg block is moving in opposite direction as compare to 2 kg block)

m1 x v1 = m2 x v2

2 x 0.5 = 4 x (-0.3)

1 ≠ -1.2

Since, m1 x v1 is not equal to m2 x v2 which means that only one block (i.e. 2 kg block) is moving in right direction which makes the other block (4 kg block) move in opposite direction.

Answer from: Quest

Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge, $v = \dfrac{e_p}{q}$ then the following gives us the potential difference, $\delta v = v_b - v_a$ $\begin{aligned} \delta v & = \dfrac{e_p_b}{q} - \dfrac{e_p_a}{q} \\ & = \dfrac{\delta e_p}{q} \end{aligned}$ the formula $\delta v = \delta e_p / q$ may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get $\delta e_p = q\delta v$ using q = 8.00 × 10⁻¹⁹ c and δv = 2.00 v, we get $\begin{aligned} \delta e_p & = (8.00\times10^{-19} \text{ c})(2.00\text{ v}) \\ & = 1.60\times 10^{-18}\text{ j} \end{aligned}$ the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.

Answer from: Quest

Amperes. i got it right on edgenuity

Another question on Physics

Physics, 21.06.2019 23:30

What are chlorofluorocarbons and what impact do they have on the atmosphere?

Answers: 1

Answer

Physics, 22.06.2019 12:00

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?

Answers: 2

Answer

Physics, 22.06.2019 15:00

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

Answers: 1

Answer

Physics, 22.06.2019 16:50

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.

Answers: 3

Answer

You know the right answer?

A2.0-kg block is attached to one end of a spring with a spring constant of 100 n/m and a 4.0-kg bloc...

Questions