Question

Which ones did I get wrong ?

kg block is sitting on a ramp that makes a 20 degree angle with the horizontal. What is the 1) A magnitude of the normal force exerted by the block on the ramp? A between 0 and 10 N between 10 and 20 N C) between 40 and 50 N D) between 20 and 30 N E) None of the above Which of the following is NOT true about forces? 2) A) Gravitational force is a type of contact force An object can experience friction forces when moving or at rest For force to be exerted on an object, it must interact with at least one other object )The Earth exerts gravitational force on an object that is sitting at rest on the surface of the Earth E) All of the above statements are true 3) A block is sliding on the surface of ice and friction forces are negligible (assume they are zero).3) When a 2N pushing force is applied to the block in the x-direction (parallel to the surface), the acceleration of the block is 3 m/s2. What is the weight of this block? A) between 0.05 and 0.1 N between 50 and 100 N ween 5 and 10 N 65 3 F-ma between 0.5 and 1 N E) none of the above 0-66 ka)(4.3) 4) A box is sitting on the floor. A 2 N pushing force is applied in a direction parallel to the floor but) the box is not moving. The coefficient of static friction is 0.35 and the mass of the box is 9 kg. What is the magnitude of the static friction force exerted by the floor on the box. A) between 35 and 40 N B) between 30 and 35 N C between 0 and 5 N D) between 5 and 10 N 2N E) None of the above 5 Which of the following statements is NOT true about fluid drag force on an object? B) Its magnitude increases with increasing magnitude of the velocity of the object It depends on the viscosity of the fluid it acts in a direction opposite to the direction of motion of the object E) All of the above statements are true

Answer 1