What average force is required to stop a 900 k g car in 9.0 s if the car is trav

Question

What average force is required to stop a 900kg  car in 9.0s  if the car is traveling at 80km/h ? Part A What is the weight of a 90kg  astronaut on Earth? Express your answer to two significant figures and include the appropriate units. FGEarth =


Part A What is the weight of a 90kg  astronaut on Earth? Express your answer to two significant figures and include the appropriate units. FGEarth =


FGEarth =
FGEarth =




Part B What is the weight of a 90kg  astronaut on the Moon? (g = 1.7 m/s2). Express your answer to two significant figures and include the appropriate units. FGMoon =

Part B What is the weight of a 90kg  astronaut on the Moon? (g = 1.7 m/s2). Express your answer to two significant figures and include the appropriate units. FGMoon =

FGMoon =
FGMoon =

Part C What is the weight of a 90kg  astronaut on Mars? (g = 3.7 m/s2). Express your answer to two significant figures and include the appropriate units. FGMars =

Part C What is the weight of a 90kg  astronaut on Mars? (g = 3.7 m/s2). Express your answer to two significant figures and include the appropriate units. FGMars =

FGMars =
FGMars =

Part D What is the weight of a 90kg  astronaut in outer space traveling with constant velocity? Express your answer to two significant figures and include the appropriate units. FGSpace =

FGSpace =

What is Huck's velocity (speed and direction) relative to the river bank? Express your answer to three significant figures and include the appropriate units. v =

v =
v =

Part B Express your answer to three significant figures and include the appropriate units. from the right horizontal direction ? =
from the right horizontal direction ? =
FGEarth =
What average force is required to stop a 900kg car in 9.0s if the car is traveling at 80km/h ? Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is in the direction opposite to the initial velocity. What is the weight of a 90kg astronaut on Earth? Express your answer to two significant figures and include the appropriate units. What is the weight of a 90kg astronaut on the Moon? (g = 1.7 m/s2). Express your answer to two significant figures and include the appropriate units. What is the weight of a 90kg astronaut on Mars? (g = 3.7 m/s2). Express your answer to two significant figures and include the appropriate units. What is the weight of a 90kg astronaut in outer space traveling with constant velocity? Express your answer to two significant figures and include the appropriate units. Huck Finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft's motion relative to the shore). The raft is traveling down the Mississippi River at a speed of 1.38m/s relative to the river bank (see the figure (Figure 1) ). What is Huck's velocity (speed and direction) relative to the river bank? Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

1. 2.47 m/s^2 acceleration i.e 2.22kN

2. 90*9.8 = 882N

3.90*1.7 =153 N

4. 90*3.7 = 333N

5.constant velocity means no acceleration so he will experience no weight.

zero weight

6.1.505 m/s with a direction 23.5 degrees from the flow of the river current

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