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1. The 85-lb force P is applied to the 200-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the crate.
2. The coefficients of static and kinetic friction between the 100-kg block and the inclined plane are 0.30 and 0.20, respectively. Determine
(a) the friction force F acting on the block when P is applied with a magnitude of 200 N to the block at rest,
(b) the force P required to initiate motion up the in- cline from rest, and (c) the friction force F acting on the block if P = 600 N.
Butene H2C=CH-CH2-CH3 can be reacted to form isotactic polybutene (PB).What is the value of the degree of polymerization n of isotactic PB with a molecular weight of 3.091×105 g/mol?
Beryllium has an HCP unit cell for which the ratio of the lattice parameters c/a is 1.568. If the radius of the Be atom is 0.1143 nm, (a) determine the unit cell volume, and (b) calculate the theoretical density of Be.
When a positron and an electron meet, they are both annihilated into pure energy. Calculate how much energy (in MeV) is released in this reaction assuming that each particle is moving at 50% the speed of light. For this question use the classical def..
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A 2.64 kg copper part, initially at 400 K, is plunged into a tank containing 4 kg of liquid water, initially at 300 K. The copper part and water can be modeled as incompressible with specific heats of 0.385 kJ/kg. K and 4.2 kJ/kg.K, respectively. For..
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