Category: General Physics
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A 1-kg of wood is pressed against a vertical wall (µs= 0.25) by a force inclined 40º upward with respect to the vertical axis.
A 1-kg of wood is pressed against a vertical wall (µs= 0.25) by a force inclined 40º upward with respect to the vertical axis. Determine the maximum force which can start the motion of the block. F = (0.25)(9.8 cos40)+(9.8 sin30) / cos(4) – 0.25(sin30)= 7. 77 N
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The coefficient of friction between the sole of a shoe and a tile span roof is 0.36.
The coefficient of friction between the sole of a shoe and a tile span roof is 0.36. What minimum slope of the roof can start slipping? Θ = tan Θ = tan 20° = 0.36
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A 1340 kg Triumph TR-8 traveling north at 43 km/hr crashes head-on into a 1850 kg Checker cab moving west at 87 km/hr.
A 1340 kg Triumph TR-8 traveling north at 43 km/hr crashes head-on into a 1850 kg Checker cab moving west at 87 km/hr. The two cars become tangled together. What is their speed a moment after the collision? If east is 0 degrees, north is 90 degrees, etc., at what angle are the entangled cars travelling just…
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A charge of -7 x 10-8 C exerts a force of 0.045 N on a charge of +6.0 x 10-7.
A charge of -7 x 10-8 C exerts a force of 0.045 N on a charge of +6.0 x 10-7. How far apart far are the charges? f=kQq/r2 Rearanged: [sqrt](kQq/r2) =[√](9×109)(7×10-8C)(6×10-7C)/(0.… r=.092m
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In reaching her destination, a backpacker walks with an average velocity of 1.27 m/s, due west.
In reaching her destination, a backpacker walks with an average velocity of 1.27 m/s, due west. This average velocity results, because she hikes for 5.89 km with an average velocity of 2.18 m/s due west, turns around, and hikes with an average velocity of 0.555 m/s due east. How far east did she walk (in…
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The froghopper, Philaenus spumarius, holds the world record for insect jumps.
The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0 degrees above the horizontal, some of the tiny critters have reached a maximum height of 58.7 cm above the level ground. The initial velocity is 4 m/s. What horizontal distance did the froghopper cover for this world-record leap?…
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A hunter aims directly at a target (on the same level) 140 m away. If the bullet leaves the gun at a speed of 280 m/s, by how much will the bullet miss the target?
A hunter aims directly at a target (on the same level) 140 m away. If the bullet leaves the gun at a speed of 280 m/s, by how much will the bullet miss the target? In projectile motion constant horizontal velocity Vx is assumed. Time to reach target is T = 140m / Vx = 0.5 s Vertical…
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What are the first three harmonics of a note produced on a 31.0 cm long violin string if waves on this string have a speed of 274.4m/s?
What are the first three harmonics of a note produced on a 31.0 cm long violin string if waves on this string have a speed of 274.4m/s? Wavelengths are 62 cm 31 cm and 62 / 3 = 20.67 cm The frequencies associated with these wavelengths ( which are the 1st, 2nd and 3rd harmonics )…