Recent content by Elvis

Vibrations and waves 1) A 5 kg mass, m, rests on a frictionless, horizontal, wooden table top, and is attached to one end of a spring anchored at its other end . If the spring has a spring constant=13 N/cm and the mass is pulled back (in the positive direction ) 20 cm and released, to the...

1) A 5 kg mass, m, rests on a frictionless, horizontal, wooden table top, and is attached to one end of a spring anchored at its other end . If the spring has a spring constant=13 N/cm and the mass is pulled back (in the positive direction ) 20 cm and released, to the nearest tenth of a joule...

Please help me with this : 1) Water circulates throughout a house in a hotwater heating system. The water is pumped at a speed of .7 m/s through a 4 cm diameter pipe in the basement under a pressure of 3 atm. What is the pressure, to the nearest N/m^2, in a 2 cm pipe on the second floor 5...

The boyanty Force is: Fb = F2 - F1 pfgA(h2-h1) pfgAh pfgV I don't know how to solve please help !

CAN ANYONE HELP ME, PLEASE ! I DON'T KNOW HOW TO SOLVE THIS PROBLEM A raft is made of 10 logs lashed together. Each is 30cm in diameter and has a length of 5.5m. How many people can the raft hold before they start getting their feet wet,assuming the average person has a mass of 70 kg? Do not...

Can Anyone help me, please! An automatic nucleus initially moving at 500 m/s emits an alpha particle in the direction of its velocity, and the new nucleus shows to 450 m/s. If the alpha particle has a mass of 4.0 u and the original nucleus has a mass of 222 u, what speed does the alpha particle...

CAN ANYONE HELP ME ? An automatic nucleus initially moving at 500 m/s emits an alpha particle in the direction of its velocity, and the new nucleus shows to 450 m/s. If the alpha particle has a mass of 4.0 u and the original nucleus has a mass of 222 u, what speed does the alpha particle have...

Please help me . (1)- A gun is fired vertically into a 1.4 kg block of wood at rest directly above it. If the bullet has a mass of 21 g and a speed of 310 m/s, how high will the block rise into the air after the bullet becomes imbeded in it ? (2)- A rocket of total mass 3700 kg is...

Problem 2 I have solved these problem ::::::The weight of the box is (18 kg)(9.80 N/kg) = 176.4 N The component of the weight parallel to the plane is (176.4 N)sin(37.0o) = 106.16 N The component of the weight perpendicular to the plane is (176.4 N)cos(37.0o) = 140.88 N So...

Problem 1: I now that : F = F uN = ma umg = ma ug = a u(9.8) = (40km/h * 1h/3600s * 1000m/km)/3.5s u = 0.324 Is this correct ? Can anyone help me for the problem 2 ? Thanks

Hi ! Can anyone help me I need help ... Problem : ************************************************** ********************** 1- A coffee cup on the dashboard of a car slides forward on the dash when the driver decelerates from 40 km/h to rest in 3.5 s or less, but not if he decelerates in a...

Thank you Rudipoo .

Hi ! Can anyone help me ? Problem : ************************************************************************ 1- A coffee cup on the dashboard of a car slides forward on the dash when the driver decelerates from 40 km/h to rest in 3.5 s or less, but not if he decelerates in a longer time. What...

Hi ! can anyone help me ? A train locomotive is pulling two cars of the same mass behind it. Show that the tension in the coupling between the locomotive and the first car is twice that between the first car and the second car, for any nonzero accelerationv of the train . thanks