### What is the normal force exerted on the cart by the floor

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Q1. A cart loaded with bricks has a total mass of 21.2 kg and is pulled at constant speed by a rope. The rope is inclined at 27.2 ? above the horizontal and the cart moves 27.1 m on a horizontal floor. The coefficient of kinetic friction between ground and cart is 0.8.

The acceleration of gravity is 9.8 m/s2.

What is the normal force exerted on the cart by the floor?

Q2. A typical atom has a diameter of about 1.0 times 10^ {- 10}, {rm {m}} Approximately how many atoms are there along a 7.9 cm line?

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