# Physics homework help

Physics homework help

Submit a 1750 words paper on the topic Formulas on Physics.

42-&nbsp.Copy of A bullet leaves a 28-in. rifle barrel at 2700 ft/s.&nbsp.What was its time in the barrel in milliseconds?

&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp. t&nbsp. =&nbsp. &nbsp. **&nbsp.&nbsp. =&nbsp.&nbsp. 0.864 mms

43-A monorail train traveling at 22 m/s must be stopped at a distance of 120 m. What is stopping time?

&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp. 0&nbsp. =&nbsp. (22 m/s)2&nbsp. -&nbsp. 2a (120)&nbsp.&nbsp.&nbsp.&nbsp. —&nbsp.&nbsp.&nbsp.&nbsp. a&nbsp. =&nbsp. 2.0167 m/s2

&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp. 0&nbsp. =&nbsp. V0&nbsp. -&nbsp. at&nbsp.&nbsp.&nbsp.&nbsp. —&nbsp.&nbsp. &nbsp.&nbsp.0&nbsp. =&nbsp. 22 m/s&nbsp. -&nbsp. (2.0167 m/s2)*t&nbsp.&nbsp.&nbsp.&nbsp. —&nbsp.&nbsp.&nbsp. &nbsp.t&nbsp. =&nbsp. 10.9 secs

44-Three masses, 2 kg, 4 kg, and 6 kg, are connected (in order) by strings and hung from the ceiling with another string so that the largest mass is in the lowest position.&nbsp. If the system feels only an acceleration upward at 4 m/s2, what is the tension in the cord that separates Block B and Block C?

&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp. FBD about C:&nbsp.&nbsp.&nbsp.&nbsp. TBC&nbsp. -&nbsp. 6 kg (9.81 m/s2)&nbsp. =&nbsp. 6 kg (4 m/s2)

&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp. —&nbsp.&nbsp.&nbsp.&nbsp. TBC&nbsp. =&nbsp. 82.86 N

45-Three masses, 2 kg, 4 kg, and 6 kg, are connected (in order) by strings and hung from the ceiling with another string so that the largest mass is in the lowest position.&nbsp.What is the tension in the cord that separates Block A and Block B?

T(top)&nbsp. -&nbsp. 6 kg (9.81 m/s2)&nbsp. =&nbsp. (2 kg + 4 kg + 6 kg) ( 4 m/s2)&nbsp.&nbsp.

T(top)&nbsp. =&nbsp. 106.86 N&nbsp.&nbsp.&nbsp.&nbsp. .&nbsp.&nbsp.&nbsp.&nbsp. T(top)&nbsp. -&nbsp. TAB&nbsp. -&nbsp. 2 kg (9.81 m/s2)&nbsp. =&nbsp. 2 kg (4 m/s2)

—&nbsp.&nbsp.&nbsp.&nbsp. TAB&nbsp. =&nbsp. 79.24 N

46-Find the mass of a body if a resultant force of 400 N causes it to decrease its velocity by 4 m/s in 3 s.

&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp. a&nbsp. =&nbsp. &nbsp.&nbsp. =&nbsp.&nbsp. 1.333 m/s2&nbsp.&nbsp.&nbsp.&nbsp. and&nbsp.&nbsp.&nbsp.&nbsp. F&nbsp. =&nbsp. ma&nbsp.&nbsp.&nbsp. —&nbsp.&nbsp.&nbsp. 400 N&nbsp. =&nbsp. m (1.333 m/s2)

&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp. —&nbsp.&nbsp.&nbsp.&nbsp. m&nbsp. =&nbsp. 300 kg

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47-A 20-kg mass hangs at the end of a rope.&nbsp.Find the acceleration of the load if the tension in the cable is 260 N.

&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp. F&nbsp. =&nbsp. ma&nbsp.&nbsp.&nbsp.&nbsp. —&nbsp.&nbsp.&nbsp.&nbsp. 260 N&nbsp. =&nbsp. (20 kg) (a)&nbsp.&nbsp.&nbsp.&nbsp. —&nbsp.&nbsp.&nbsp.&nbsp. a&nbsp. =&nbsp. 13 m/s2

48-Find the weight of a body if a resultant force of 400 N causes it to decrease its velocity by 4 m/s in 3 s.

&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp. A&nbsp. =&nbsp. &nbsp.&nbsp. =&nbsp.&nbsp. 1.333 m/s2&nbsp.&nbsp.&nbsp.&nbsp. —&nbsp.&nbsp.&nbsp.&nbsp. 400 N&nbsp. =&nbsp. m (1.333 m/s2)

&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp. —&nbsp.&nbsp.&nbsp.&nbsp. m&nbsp. =&nbsp. 300 kg&nbsp.&nbsp.&nbsp.&nbsp. and&nbsp.&nbsp.&nbsp.&nbsp. W&nbsp. =&nbsp. mg&nbsp. =&nbsp. (300 kg) (9.81 m/s2)&nbsp. =&nbsp. 2943 N

49-Two masses (m1=2kg and m2=8kg), connected by a cord, hang straight down from either side of a light frictionless pulley.&nbsp.What is the&nbsp.acceleration of the system?

&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp.&nbsp. 2(9.81 m/s2)&nbsp. -&nbsp. 8(9.81 m/s2)&nbsp. =&nbsp. (a) (2&nbsp. +&nbsp. 8) kg&nbsp.&nbsp.&nbsp.&nbsp. —&nbsp.&nbsp.&nbsp. &nbsp.a&nbsp. =&nbsp. -5.9 m/s2

50-&nbsp.An 800-kg elevator is lifted vertically by a strong rope.&nbsp.Find the acceleration of the elevator if the rope tension is 7840 N.&nbsp. &nbsp. &nbsp. &nbsp. &nbsp. &nbsp.