Hey could somebody help me with my homework problems please and thank you. Which
ID: 1266336 • Letter: H
Question
Hey could somebody help me with my homework problems please and thank you.
Which of the following is not a vector quantity? Energy Velocity Acceleration Displacement A bird, accelerating from rest at a constant rate, experiences a displacement of 28 m in 11 s. 0.21m/s2 0.46 m/s2 0.64 m/s2 0.78 m/s2 A rock released at rest from the top of a tower, hits the ground after 1.5 s. What is the speed of the rock as it hits the ground? 15 m/s 20 m/s 31 m/s 39 m/s Arvin the Ant is on a picnic table. He travels 30 cm castward, then 25 cm northward, and finally 15 cm westward. what is the magnitude of arvin's net displacement? 70 cm 57 cm 52 cm 29 cm A ball is rolled horizontally off a table with an initial speed of 0.24 m/s. A stop watch measures the ball's trajectory time from table to the floor to be 0.30s. How far away from the table does the ball land? 0.055m 0.072mm 1.2m 1.9m A cart of weight 20 N is accelerated across a level surface at 0.15m/s2. What net force acts on the wagon? 0.92N 0.331N 3.0N 4.5N A baseball batter hits an incoming 40-m/s fastball. The ball leaves the bat at 50 m/s in the opposite direction after a ball-on-bat contact time of 0.030 s. What is the force exerted on the 0.15-kg baseball? 450 N 250 N 90 N 50 N A copper wire of length 2.0 m hanging vertically, cross sectional area 7.1 Times 10-6 m2 and young's modulus 11 Times 1010 N/m2 has a 200-kg load hung on it. What is its increase in length? 0.50 mm 1.0 mm 2.5 mm 5.0 mm What is the total force on the bottom of a 2.0-m-diameter by 1.0-m-deep round pool due to the weight of the air and the weight of the water? 3.4 Times 105N 2.4 Times 106N 3.2 Times 106N 6.0 Times 106 N How deep under the surface of a freshwater lake would the absolute pressure be double that the surface? 1.00 m 9.80 m 10.3 m 32.2 m Which best describes the relationship between two systems in thermal equilibrium? No net energy is exchanged. Volumes are equal. Masses are equal. Zero velocity. Two moles of nitrogen gas are contained in an enclosed cylinder with a movable position. If the gas temperature increases by 5.0 C2. How much heat was transferred into it? 4.5 Times 104 j 9.0 Times 104 j 1.4 Times 105j 2.0 Times 105 j On a sunny day at the beach, the reason the sand gets so hot and the water stays relatively cool is attributed to the difference in which property between water and sand? Mass density Specific heat Emissivity Thermal conductivity A machine gear consists of 0.10 kg of iron and 0.16 kg of copper. How much total heat is generated in the part if its temperature increases by 35 C degree? Specific heats of iron and copper are 450 J/kg degree C and 390 J/kg degree C respectively.) 910 J 3,800 J 4,000 J 4,400 J A windowpane is half a centimeter thick and has an area of 1.0 m2. The temperature difference between the inside and outside surface of the pane is 15 degree C. What is the rate of heat flow through this window? (Thermal conductivity for glass is 0.84 J/s m degree.) 50,000 J/s 2,500 J/s 1,300 J/s 630 J/s During an isobaric process, which one of the following does not changer? Volume Temperature Internal energy Pressure.Explanation / Answer
1) c)v=a/t
2) c)1.2*10^57
3) a)Energy
4) b)0.46m/sec^2
5) a)15 m/sec
6) d)29cm
7) b)0.072 m
8) b)0.31 N
9)a)450 N
10) d)0.47
11) a)240 J
12) c)Kg/s^2
13) d)4.7 m/sec
14) d)2.4 Kgm/sec
15) d)9
16) d)18 sec
17) c)centrepetal accleration
18)a)(1,1)
19) c)ML^2
20) d)2/5
21)d)stress
22)d)5 mm
23)c)3.2*10^6
24)c)10.3 m
25) a)No net energy is exchanged
26) b)310 K
27) a)0.65 cm
28) b
29) a)4.5*10^4 J
30) c) emissivity
31) b)3800 J
32) b)2500 J/s
33) d)pressure