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A block with mass m1 = 8.9 kg is on an incline with an angle θ...

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Physics

A block with mass m1 = 8.9 kg is on an incline withan angle θ = 31° with respect to the horizontal. For the firstquestion there is no friction between the incline and theblock.

1)When there is no friction, what is the magnitude of theacceleration of the block?

2)Now with friction, the acceleration is measured to be only a =3.13 m/s2. What is the coefficient of kinetic frictionbetween the incline and the block?

3)To keep the mass from accelerating, a spring is attached withspring constant k = 157 N/m. What is the coefficient of staticfriction if the spring must extend at least x = 16 cm from itsunstretched length to keep the block from moving down theplane?

4)The spring is replaced with a massless rope that pullshorizontally to prevent the block from moving. What is the tensionin the rope?

5)Now a new block is attached to the first block. The new blockis made of a different material and has a coefficient of staticfriction μ = 0.9. What minimum mass is needed to keep the systemfrom accelerating?

please please help me please

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