Question 5 6 pts To the nearest newton, what is the required net force to give a

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Question 5 6 pts To the nearest newton, what is the required net force to give a bicyclist and bicycle with a combined mass of 78.1 kg an acceleration of 2.83 m/s2?


Flag this Question Question 6 6 pts A car initially contains just its driver. The combined mass of car and driver is 1200 kg. When the gas pedal is pushed down all the way, the car reaches its maximum acceleration of 5.6 m/s2. If the driver then picks up three of his friends, the combined mass is increased by 300 kg. What is the maximum acceleration possible now if the force provided by the engine remains the same as before? Round your answer to the nearest tenth of a m/s2.


Flag this Question Question 7 6 pts A motorcycle moving at 14.0 m/s increases in speed to 26.0 m/s over a period of 7.20 s. If the motorcycle’s mass is 390 kg, what net force acts on the motorcycle? Round your answer to the nearest newton.


Flag this Question Question 8 6 pts The brakes of a 210 kg sled are applied while it is moving at 8.5 m/s, which exerts a force of 300 N to slow the sled down. To the nearest meter, how far does the sled travel while coming to a stop?


Flag this Question Question 9 6 pts A 0.45 kg yo-yo is whirled around by its string in a circle of radius 0.85 m at a constant speed of 3.2 m/s. To the nearest tenth of a newton, what is the required centripetal force to keep this yo-yo whirling in a circle?



Question 11 6 pts What is the weight of a 6.96 kg pug in newtons? Round your answer to the nearest tenth of a newton.


Flag this Question Question 12 6 pts An astronaut weighs 780 N on the Earth’s surface. When the astronaut lands on Planet X, she weighs 200 N. To the nearest tenth of a m/s2, what is the acceleration of gravity on Planet X? (hint: first find her mass!)


Flag this Question Question 13 6 pts An elevator car loaded with two passengers has a mass of 1500 kg. What tension must be applied by the elevator cable to give the car an acceleration of 1 m/s2 upward? Round your answer to the nearest newton.


Flag this Question Question 14 6 pts An 800 kg cannon sits at rest, loaded with a 5 kg cannonball. When the cannon is fired horizontally, the exploding gunpowder accelerates the cannonball at an average acceleration of 4800 m/s2through the barrel, with the cannonball finally flying out of the barrel at a speed of 120 m/s toward the East. To the nearest newton, the net force that acts on the cannon while firing has a magnitude of N and points toward the .
Question 5 6 pts To the nearest newton, what is the required net force to give a bicyclist and bicycle with a combined mass of 78.1 kg an acceleration of 2.83 m/s2?


Flag this Question Question 6 6 pts A car initially contains just its driver. The combined mass of car and driver is 1200 kg. When the gas pedal is pushed down all the way, the car reaches its maximum acceleration of 5.6 m/s2. If the driver then picks up three of his friends, the combined mass is increased by 300 kg. What is the maximum acceleration possible now if the force provided by the engine remains the same as before? Round your answer to the nearest tenth of a m/s2.


Flag this Question Question 7 6 pts A motorcycle moving at 14.0 m/s increases in speed to 26.0 m/s over a period of 7.20 s. If the motorcycle’s mass is 390 kg, what net force acts on the motorcycle? Round your answer to the nearest newton.


Flag this Question Question 8 6 pts The brakes of a 210 kg sled are applied while it is moving at 8.5 m/s, which exerts a force of 300 N to slow the sled down. To the nearest meter, how far does the sled travel while coming to a stop?


Flag this Question Question 9 6 pts A 0.45 kg yo-yo is whirled around by its string in a circle of radius 0.85 m at a constant speed of 3.2 m/s. To the nearest tenth of a newton, what is the required centripetal force to keep this yo-yo whirling in a circle?



Question 11 6 pts What is the weight of a 6.96 kg pug in newtons? Round your answer to the nearest tenth of a newton.


Flag this Question Question 12 6 pts An astronaut weighs 780 N on the Earth’s surface. When the astronaut lands on Planet X, she weighs 200 N. To the nearest tenth of a m/s2, what is the acceleration of gravity on Planet X? (hint: first find her mass!)


Flag this Question Question 13 6 pts An elevator car loaded with two passengers has a mass of 1500 kg. What tension must be applied by the elevator cable to give the car an acceleration of 1 m/s2 upward? Round your answer to the nearest newton.


Flag this Question Question 14 6 pts An 800 kg cannon sits at rest, loaded with a 5 kg cannonball. When the cannon is fired horizontally, the exploding gunpowder accelerates the cannonball at an average acceleration of 4800 m/s2through the barrel, with the cannonball finally flying out of the barrel at a speed of 120 m/s toward the East. To the nearest newton, the net force that acts on the cannon while firing has a magnitude of N and points toward the .
Question 5 6 pts To the nearest newton, what is the required net force to give a bicyclist and bicycle with a combined mass of 78.1 kg an acceleration of 2.83 m/s2?


Flag this Question Question 6 6 pts A car initially contains just its driver. The combined mass of car and driver is 1200 kg. When the gas pedal is pushed down all the way, the car reaches its maximum acceleration of 5.6 m/s2. If the driver then picks up three of his friends, the combined mass is increased by 300 kg. What is the maximum acceleration possible now if the force provided by the engine remains the same as before? Round your answer to the nearest tenth of a m/s2.


Flag this Question Question 7 6 pts A motorcycle moving at 14.0 m/s increases in speed to 26.0 m/s over a period of 7.20 s. If the motorcycle’s mass is 390 kg, what net force acts on the motorcycle? Round your answer to the nearest newton.


Flag this Question Question 8 6 pts The brakes of a 210 kg sled are applied while it is moving at 8.5 m/s, which exerts a force of 300 N to slow the sled down. To the nearest meter, how far does the sled travel while coming to a stop?


Flag this Question Question 9 6 pts A 0.45 kg yo-yo is whirled around by its string in a circle of radius 0.85 m at a constant speed of 3.2 m/s. To the nearest tenth of a newton, what is the required centripetal force to keep this yo-yo whirling in a circle?



Question 11 6 pts What is the weight of a 6.96 kg pug in newtons? Round your answer to the nearest tenth of a newton.


Flag this Question Question 12 6 pts An astronaut weighs 780 N on the Earth’s surface. When the astronaut lands on Planet X, she weighs 200 N. To the nearest tenth of a m/s2, what is the acceleration of gravity on Planet X? (hint: first find her mass!)


Flag this Question Question 13 6 pts An elevator car loaded with two passengers has a mass of 1500 kg. What tension must be applied by the elevator cable to give the car an acceleration of 1 m/s2 upward? Round your answer to the nearest newton.


Flag this Question Question 14 6 pts An 800 kg cannon sits at rest, loaded with a 5 kg cannonball. When the cannon is fired horizontally, the exploding gunpowder accelerates the cannonball at an average acceleration of 4800 m/s2through the barrel, with the cannonball finally flying out of the barrel at a speed of 120 m/s toward the East. To the nearest newton, the net force that acts on the cannon while firing has a magnitude of N and points toward the .

Explanation / Answer

1.f=ma

F=78.1*2.83

F=221 N

2 1500:x=1200:5.6

1500*5.6=1200x

X=7

Acceleration =7 m/s2

3 speed change = 26-14 = 12m/s

Acceleration

12/7.2

=1.77

F=ma

F=390*1.77

F= 650 N

4 friction =force/weight

= 300/1785

=0.16

5. Torque = radius * force

=0.85*1.44

=1.22

6 6.9 kg = 68.25N

7 mass= force /Acceleration

M=700/9.8

M= 79.59 kg

200= 79.59* Acceleration

A= 2.51m/s2

8 F=1500*1

F= 1500

9 f= 5*4800

F= 20000

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