physics

A block and tackle system has 6 pulleys. If the efficiency of the machine is 60%, determine its mechanical advantages.

A. 12.0 B. 10.0 C. 3.6 D. 1.8 Correct Answer: Option C C. 3.6 Explanation M.A = (Z×V.R)/100 = (60×5)/100…

6 years ago

A load of mass 120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms‾²]

A. 60W B. 80W C. 100W D. 120W Correct Answer: Option B B. 80W Explanation p = mgh/t=(120×10×2)/30 = 80W

6 years ago

Which of the following statements correctly defines quantitatively the work done by a force? the product of the force and the distance moved

A. parallel to the line of action of the force from a reference point B. perpendicular to the line of…

6 years ago

In the diagram above, AB represents a uniform rod of length 1.50m which is in equilibrium on a pivot at P, If AP = 40cm, calculate the mass of the rod. [g = 10ms‾²]

A. 0.280kg B. 0.400kg C. 0.613kg D. 0.800kg Correct Answer: Option D Explanation m = (0.7×40)/35 =0.8kg

6 years ago

A spiral spring of natural length 30.0cm and force constant of 20Nm‾¹ is compressed to 20.0cm. Calculate the energy stored in the spring

A. 0.1J B. 1.0J C. 10.0J D. 100.0J Correct Answer: Option A Explanation Energy = ½ke²=½ × 20×0.1² = 0.1J

6 years ago

An object A is held in equilibrium as illustrated in the diagram above. Using the data on the diagram determine the magnitude, W of the weight of

A. 23N B. 17N C. 7N D. 5N Correct Answer: Option B B. 17N Explanation W = √15²+8² = 17N…

6 years ago

An object is acted upon by a system of parallel forces causing the object to be in static equilibrium. Which of the following statements is not correct?

A. The resultant of the parallel force is zero B. the algebraic sum of the moment of the forces is…

6 years ago

An object is released from rest at a height of 25m. Calculate the time it takes to fall to the ground. [g = 10ms‾²]

A. 25.00s B. 10.00s C. 2.50s D. 2.24s Correct Answer: Option D D. 2.24s Explanation t = √2s/g =√2×25/10 =2.24…

6 years ago

A car takes off from rest and covers a distance of 80m on a straight road in 10s. Calculate the magnitude of its acceleration

A. 1.25ms‾² B. 1.60ms‾² C. 4.00ms‾² D. 8.00ms‾² Correct Answer: Option B B. 1.60ms‾² Explanation s = ut+½at² 80 =…

6 years ago

The magnitude of the force required to make an object of mass, M move with speed, V in a circular of radius R is given by the expression.

A. mr/v B. mr²/v C. mv²/r D. mv/r² Correct Answer: Option C C. mv²/r

6 years ago
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