Physics, 26.09.2019 11:30 jjel18

For the system below where m1=45kg and the coefficient of statice friction between m1 and the table is .40, how large must m2 be made without the system starting into motion? not sure how to start, would be awesome, !

Answers: 1

Show answers

Answers

They're asking what mass M2 should be so that it's as large as possible but the M2 block does not fall (which means the M1 block doesn't move either)

Static friction is holding M1 in place. The largest amount of static friction to overcome is equal to μ∗η

greek letter mu = μ = coefficient of static friction = 0.4
greek letter eta = η = normal force = m*g = 45*9.8 = 441

the normal force is approximate

So the maximum force of static friction is equal to μ∗η=0.4∗441=176.4

This is the force to overcome. If the force pulling down on M2 is larger than 176.4, the whole system will move. If the force pulling down on M2 is 176.4 roughly, then we're at the max limit. It's the largest amount of force allowed where the system is stationary

So we have the force (176.4) and we know g = 9.8 approx

so,

F = m*g
176.4 = m*9.8
176.4/9.8 = m*9.8/9.8
18 = m
m = 18

So it looks like if M2 is 18 kg, then the system stays still and this is the largest M2 can get. Any larger and the system will move.

Answer from: Quest

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm. the wire diameter is d = 0.9 mm. the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2) in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

Answer from: Quest

you go to your settings preference and in the end youll see sth that says "i want to delete my acc" click on it and u'll acc will be deleted but u have to wait.

Another question on Physics

Physics, 21.06.2019 22:00

Identify the forces that contribute to the centripetal force on the object in each of the following examples: a. a bicyclist moving around a flat, circular track b. a bicycle moving around a flat, circular track c. a racecar turning a corner on a steeply banked curve

Answers: 1

Answer

Physics, 22.06.2019 06:30

The energy of a photon was found to be 3.38 × 10–19 j. planck’s constant is 6.63 × 10–34 j • s. which color of light corresponds to this photon?

Answers: 2

Answer

Physics, 22.06.2019 08:20

The two required components for a generator are

Answers: 3

Answer

Physics, 22.06.2019 12:30

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?