A block with a mass of 6.66 kg is at rest on an inclined surface. The surface makes an angle of  28.3° relative to horizontal. The block remains at rest. What is the magnitude of the force of gravity that acts on the block?

A 20 kg book is at rest on the surface of a horizontal desk. What is the magnitude of the normal force acting on the book?

Two blocks each of mass m=3.21 kg are fastened to the top of an elevator as in the figure. (A) if the elevator has an upward acceleration a= 1.60 m/s^2 , find the tensions T1 and T2 in the upper and lower strings. T1 = N. T2= N (B) if the strings can withstand a maximum tension of 89.0 N what maximum acceleration can the elevator have before the upper strings breaks? M/s2 ?

Two horizontal forces, P and Q, are acting on a block that is placed on a table. We know that P is directed to the left but the direction of Q is unknown; it could either be directed to the right or to the left. The object moves along the x-axis. Assume there is no friction between the object and the table. Here P = -6.1 N and the mass of the block is 3.8 kg. P (a) What is the magnitudeand direction of Q (in N) when the block moves with constant velocity? (Indicate the direction with the sign of your answer.) 6.1 N (b) What is the magnitude and direction of Q (in N) when the acceleration of the block is +7.5 m/s2. (Indicate the direction with the sign of your answer.) X 22.4 The acceleration given here is due to the net force acting on the object. N (c) Find the magnitude and direction of Q (in N) when the acceleration of the block is -7.5 m/s2. (Indicate the direction with the sign of your answer.) X -34.6 What is the direction of motion of the object when the acceleration is…