Physics, 27.10.2021 21:20, journey888
1. The area of the body of a man is about 2.5 m^2. Find the force exerted on him by earth’s atmosphere when he is at an altitude of 50 m
2. A rod 0.5 m long floats vertically in a liquid with 0.3 m above the surface. What is the density of the rod if the relative density of the liquid is 1.2?
3. A horizontal pipe with a cross-sectional area of 8.6 cm^2 has a constriction with a cross-sectional area of 2.6 cm^2. Water is flowing through the pipe with a speed of 3.5 m/s where the pressure is 70 cm Hg. Find the (a) speed and (b) pressure in the constriction.
4. A horizontal stream of water leaves an opening on the side of a tank filled with water to a height of 4.0 m. If the opening is 1.0 m above the ground, find (a) the speed of water through the opening and (b) the horizontal distance the water will strike the ground starting from the base of the tank
Answers: 2
Physics, 22.06.2019 10:30, SauceyNaee
Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.
Answers: 1
Physics, 22.06.2019 16:30, belle5828
3. a lunar exploration vehicle was created by a research team. it weighs 3,000 kg on the earth. it needs an acceleration of 10 m/s2 on the moon. in order to have the same acceleration, what will be the net force acting on the vehicle on the earth?
Answers: 2
Physics, 22.06.2019 18:30, kayleahrayne
Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2. how much is the spring compressed x from its natural length? 1) x = v0*sqrt(k/(mg)) 2) x=v0*sqrt(m/k) 3) x=v0*((mk)/g) 4) x=v0*sqrt(k/m) 5) x=v0*(m/kg) 6) x=v0*sqrt((mg)/k) 7) x=(v0)^2/(2g) 8) x=v0*(k/(mg)) 9) x=(v0)^2/(2m) 10) x=v0*((mg)/k)
Answers: 3
1. The area of the body of a man is about 2.5 m^2. Find the force exerted on him by earth’s atmosphe...
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