Find the elongation of the rod...

a force of 1.0 * 10^3 N is applied to a steel rod of length 1 m and a circular croos-section of area 10cm^2. Find the elongation of the rod. Young'd modulus for steel is 2.0 * 10^11 Pa. a. 5.0 * 10^-6 m b. 1.0 * 10^-6 m c. 2.0 * 10^-6 m d. 3.0 * 10^-6 m

the coordinates of the third mass ...

The center of mass of three objects is located at (1,0). One object with a mass of 5 kg is at (-2,-1) and a second object with a mass of 2 kg is at (0,0). Find the coordinates of the third mass of 3 kg. a.(1.7, 6.7) b.(2, 6) c. (1.3, 5.3) d. (6.7, 1.7)

a 3 kg bowling ball trraveling

a 3 kg bowling ball trraveling with a velocity of 3 m/s collides head-on with another bowling ball of the same mass traveling with a velocity of -2 m/s. If the collision is perfectly elastic, the velocties of the bowling balls after the collision is: a. 2 m/s an -3 m/s b. 5 m/s and 0 c/-2 m/s and -3 m m/s/s d. -2m/s and 3

an object with a mass of 2kg

an object with a mass of 2kg traveling with a velocity of 3 m/s, collides head-on and elastically with a staionary object of mass 0.5 kg. The velocity of the kg mass after the collision is: a. 2.3 m/s b. 1 m/s c. 1.8 m/s d. 1.5 m/s

the crankshaft of an engine

the crankshaft of an engine is accelerated from rest at the uniform rate of 4 rad/s^2 for 30 seconds. find the rotational speed of the crankshaft at the end of 30 s in rev/min. a. 1150 rev/min b. 1900 rev/min c. 19 rev/min d. 190 rev/min

find the mass of the log...

a log of wood is floating in water with 40% of its volume above the surface of the water. if the volume of the log is 0.4 m^3, find the mass of the log. a. 200kg b. 240 kg c. 160 kg d. 16 kg

find the average force exerted by the ball on the wall...

a 200 g ball hits a wall perpindicualry with a velocity of 30 m/s and rebounds back perpendiculary with a velocity of 20 m/s. if the collision lasts for 5 ms, find the average force exerted by the ball on the wall. a. 2000N b. 6000N c. 4000N d. 1000N

the bulk modulus of a gas

the bulk modulus of a gas varies with pressure. In the case of the air, the bulk modulus of air is equal to 1.40 times its pressure. the atmospheric pressure at sea level is 1.01 * 105 N/m2. The density of air at sea level is 1.20 kg/m3. for these conditions, what is the speed of sound as it passes through the air/ a.328 m/s ...continues

a pendulum of length 2 meters

a pendulum of length 2 meters is taken to the moon. if this pendulum makes 10 oscillations in 32.0 seconds, what is the value of gravitational acceleration on this moon? a. 3.86 m/s^2 b. 2.54 m/s^2 c. 7.71 m/s^2 d. 9.86 m/s^2

the intensity of sound at a given point

the intensity of sound at a given point is measured to be 0.0005 W/m^2. what is the decibel level of the sound? a. 97 db b. 87 db c. 90 db d. 55 db