Physics, 05.12.2019 01:31, raven681

Apiano has a mass of 185 kg, and the coefficient of friction between it and the floor is 0.39. what is the maximum force of friction between the piano and the floor?

707 n
523 n
1813 n
1208 n

Answers: 1

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The mass of the piano is 185 kg, therefore its weight is
W = (185 kg)*(9.8 m/s²) = 1813 N

The normal reaction force on the piano from the floor is N = 1813 N, according to Newton's 3rd Law.

The coefficient of friction between the piano and the floor is given as μ = 0.39.

By definition, the frictional force is
F = μN
= 0.39*1813
= 707.07 N

707 N

answered: Guest

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:

answered: Guest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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Apiano has a mass of 185 kg, and the coefficient of friction between it and the floor is 0.39. what...