Question

Two blocks, one made of wood and one of copper, have equal volumes. The wooden block is floating on water, and the copper block is completely submerged. Which block has a greater buoyant force acting on it? It is known that copper has higher density than wood.

Question 6 options:

	The wooden block
	The buoyant force acting on both is zero
	The copper block
	Both have equal buoyant force acting on them

Question 7 (2 points)

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A CD makes 300 full revolutions in 1 minute. The distance between the center of the disk and point 3 is 5.0 cm. What is the angular speed of point 3?

Question 7 options:

	21 rad/s
	41 rad/s
	31 rad/s
	51 rad/s
	Zero

Question 8 (2 points)

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A concrete block is placed over a wooden table. One pulls on the block to the right with a force of 100 N (in the figure indicated by the vector pointing to the right). The force of friction between the block and the table is 120 N (in the figure indicated by the vector pointing to the left). What happens with the block?

Question 8 options:

	The block is moving to the right
	The block is at rest
	The block is moving to the left

Question 9 (2 points)

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A golf ball is projected straight upward in the +y-direction. Ignore air resistance. Which graphs shows the total mechanical energy of the ball as a function of time? Ignore air resistance.

Question 9 options:

	d
	b
	a
	c
	e
	f

Question 10 (2 points)

Saved

If the temperature of an ideal gas changes by 20 degrees Celsius, what is the change in Fahrenheit?

Question 10 options:

	100
	36
	32
	273
	0

Answer 1

(6) The buoyant force on an object submerged in water depends on volume and density of the object. since the volume is given as same for both the objects, thus It depends only on the density of the object. since copper has higher density than wood therefore copper block has greater buoyant force.

(7) Angular speed is constant for all the distances from centre but linear speed changes, thus Angular speed at point 3 is given by;

(8) since the applied force is less than frictional force thus block is at rest.

(9) graph is not attached with this question.

(10) relationship for celcius and Fahrenheit is;

differentiate the above equation;