vectors
a 5 newton force directed east and 5 newton force directed north act on a object, whats the resultant force?
7 newtons north east
into how many possible components can a single force be resolved?
in a box suspenden by a rope. what are the forces applied to it?
tension force and gravitational force
a runner starts from rest and accelerates unifromly to a speed of 8 m/s in 4 seconds. what is the magnitude of the acceleration of the runner?
2 meters per square second
If two vectors are equal, what can you say about their components?
they are equal
a student applies a 20 newton force to move a crate ar a constant speed of 4 m/s across a surface. how much work its done by the student on the crate in 6 seconds?
480 J
if an object its suspended in mid air by a spring, what are the forces acting on it?
spring force and gravitational force
a 2400 kg car is travelling at a speed of 20 m/s. compared to the magnitude of the force required to stop the car in 12 seconds, what is the magnitude of the force required to stop the car in 6 seconds?
twice as great.
Suppose you walk 18.0 m straight west and then 25.0 m straight north. How far are you from your starting point and what is the compass direction of a line connecting your starting point to your final position?
30.8 m
if an object of 17.3 kg its hanging from two ropes in which one ropes has an angle of 40 degrees and the second rope has an angle of 52 degrees. what are the tension that both ropes exter?
rope of 40 degrees the tension is 104.5 and the rope of 52 degrees 130.03
in a box sliding across a inclined surface, what are the forces acting on it?
gravitational force, normal force and friction force
A racehorse coming out of the gate accelerates from rest to a velocity of 15.0 m/s due west in 1.80 s. What is its average acceleration?
8.33 m/s2
A scuba diver makes a slow descent into the depths of the ocean. His vertical position with respect to a boat on the surface changes several times. He makes the first stop 9.0 m from the boat but has a problem with equalizing the pressure, so he ascends 3.0 m and then continues descending for another 12.0 m to the second stop. From there, he ascends 4 m and then descends for 18.0 m, ascends again for 7 m and descends again for 24.0 m, where he makes a stop, waiting for his buddy. Assuming the positive direction up to the surface, express his net vertical displacement vector in terms of the unit vector. What is his distance to the boat?
49 m
A 63.0-kg sprinter starts a race with an acceleration of 4.20𝑚/𝑠24.20m/s2. What is the net external force on him?
260 N
two people are pulling on different ropes attach to an object. What are the forces applied to the object?
Force of tension to left and right, normal force up and g force down
A batter hits a baseball straight upward at home plate and the ball is caught 5.0 seconds, whats the initial velocity of the ball?
24.5 m/s