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xgrape01
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1.
Suppose a 66-kg boy and a 42-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
Newton's Second Law of Motion?
I tried to use Newton's Second Law but got a incorrect answer
2.
A 4570-kg helicopter accelerates upward at 1.8 m/s2. What lift force is exerted by the air on the propellers?
I did 4570/1.8 =2538.8888 N but that seems too big
3. An 880-kg (1945 lb) dragster, starting from rest, attains a speed of 26.0 m/s (58.2 mph) in 0.59 s.
(a) Find the average acceleration of the dragster during this time interval.
m/s^2
(b) What is the magnitude of the average net force on the dragster during this time?
N
(c) Assume that the driver has a mass of 68 kg. What horizontal force does the seat exert on the driver?
880-68 = 812?
Homework Statement
Suppose a 66-kg boy and a 42-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
Homework Equations
Newton's Second Law of Motion?
The Attempt at a Solution
I tried to use Newton's Second Law but got a incorrect answer
2.
A 4570-kg helicopter accelerates upward at 1.8 m/s2. What lift force is exerted by the air on the propellers?
I did 4570/1.8 =2538.8888 N but that seems too big
3. An 880-kg (1945 lb) dragster, starting from rest, attains a speed of 26.0 m/s (58.2 mph) in 0.59 s.
(a) Find the average acceleration of the dragster during this time interval.
m/s^2
(b) What is the magnitude of the average net force on the dragster during this time?
N
(c) Assume that the driver has a mass of 68 kg. What horizontal force does the seat exert on the driver?
880-68 = 812?