A grass trimmer for landscaping has a rotating head which consists of a spool of nylon line, with a strand of line that extends out from the edge. The spool has an inner diameter of 3.00 cm and an outer diameter of 18.0 cm, and a mass of 100 g. The strand has a length of 16.0 cm. The nylon line has a linear density of 10.0 g/m. 16.0 cm -3.00 cm 18.0 cm- (a) When switched on, the trimmer speeds up from 0 to 2,250 rev/min in 0.175 s. What average power (in W) is delivered to the head by the trimmer motor while it is accelerating? (Round your answer to at least one decimal place.) (b) When the trimmer is cutting grass, it spins at 2,100 rev/min and the grass exert an average tangential force of 6.15 N on the outer end of the line, which is still at a radial distance of 16.0 cm from the outer edge of the spool. What is the power (in W) delivered to the head under load?

Q: 2. A solid cylinder (radius= 16.0 cm, height = 16.0 cm) has a mass of 10.94 kg. This cylinder is…

A: Given Radius of solid cylinder = r = 16 cm Height of solid cylinder= h = 16 cm Mass of solid…

Q: 4. A rectangular solid of height 5.00 cm is placed into a cup of water and a height of 2.00 cm…

A: Here, the object is floating. So, the net force acting on it is zero. Upward force = Downward force…

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Q: 7. A liquid is flowing through a horizontal pipe whose radius is 2.04 × 10-² m. The pipe bends…

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Q: Gold can be hammered into decorative gold leaf, which is only 1.00E-07 m thick. If 1.88 troy ounce…

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Q: 4. A solid cylinder (radius = 18.0 cm, height = 13.5 cm) has a mass of 11.68 kg. This cylinder is…

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A: According to Archimedes principle Buoyant force = weight of liquid displaced

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Q: A horizontal segment of pipe tapers from a cross-sectional area of 48.3 cm to 0.500 cm. The pressure…

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Q: 9. A liquid is flowing through a horizontal pipe whose radius is 2.14 x 10-2 m. The pipe bends…

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Q: A hollow iron ball with a mass of 3 kg is floating in oil with density of 900 kg/cub.m. Density of…

A: Yes we can find by using Archimedes principle. As per this principle, Buoyant force=weight of…

Q: A rock is suspended by a light string. When the rock is in air, the tension in the string is 45.0 N…

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Q: 5. A lead block is suspended by means of a string from the underside of a 8.50 kg block of wood of…

A: The mass of the wood block is 8.50 kg. The density of the wood is 712 kg/m3. The density of the lead…

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Q: out from the edge. The spool has an inner diameter of 3.00 cm and an outer diameter of 18.0 cm, and…

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Q: A container has a large cylindrical lower part with a long thin cylindrical neck open at the top.…

A: P = F/A

Q: 2. A blood pressure is reported as 50 mm mercury. The density of mercury is 13.6 gram/cm³ and g =…

A: Write the given values with the suitable variables. h=50 mm=0.050 mρ=13.6 g/cm3=13.6×10-310-6…

Q: A barge can be thought of as a 40.0 m x 10.0 m x 3.00 m rectangular box. 25% of the barge’s volume…

A:

Q: 7. A lead block is suspended by means of a string from the underside of a 5.50 kg block of wood of…

A:

Q: The students build a raft made of 15 logs lashed together. Each log is 53.2 cm in diameter and has a…

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Q: Water travels through a pipe at 8.57 m/s. The pipe expands from a crossectional area of 2.8 m2 to an…

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Q: 10. A diver goes to the bottom of the deep end of the swimming pool. She is 3.0 m below the surface…

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Q: A block of birch wood floats in oil with 89.4% of its volume submerged. What is the density of the…

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Q: A block of birch wood floats in oil with 91.6% of its volume submerged. What is the density of the…

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Q: 5. A lead block is suspended by means of a string from the underside of a 5.00 kg block of wood of…

A: as tension is internal force, we have to solve for forces on wooden block.

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Fluid Pressure

The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.

Gauge Pressure

Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.