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- Check Your Understanding Find the direction of the resultant for the 1.50-kg model helicopter.A large rocket has a mass of 2.00106kgat takeoff, and its engines produce a thrust of 3.50107N . (a) Find its initial acceleration if it takes off vertically. (b) How long does it take to reach a velocity of 120 km/h straight up, assuming constant mass and thrust?Check Your Understanding How does your weight at the top of a tall building compare with that on the first floor? Do you think engineers need to take into account the change in the value of g when designing structural support for a very tall building?
- Repeat the previous problem for a situation in which the rocket sled decelerates at a rate of 201m/s2 . In this problem, the forces are exerted by the seat and the seat belt.A 100-kg astronaut finds himself separated from his spaceship by 10 m and moving away from the spaceship at 0.1 m/s. To get back to the spaceship, he throws a 10-kg tool bag away from the spaceship at 5.0 m/s. How long will he take to return to the spaceship?O A force f: 3i+4j is applied abady of mass (M) . Ahe moved from rest (x.:or Uo:0 ) on with aconstant acceleralion, the posidion vector ef abard the body r:tzt, find the fallowaing:- O The value and direetion of the force 9+16 や 5N 53 b) The veloci ty at I sec . Y: t4てt →4 2t +2 dt wtre -V = 2 € +2 de -u: 4 mis O tohat is the Thess acceleration of the body at this time dv : 2 mi? V: 2t+2 a cons fant aeceleration a: 2 mis d) what rs the mas at Mo brdy E:: 25 kg F: ma M: mase とM: 2-5 ky
- A car of mass 1000 kg is moving with a velocity of 10m/s and is acted upon by a forward force of 1000 N due engine and retarding force of 600N due to friction . What will be its velocity after 10 seconds ?As a protest against the umpire’s calls, a baseball pitcherthrows a ball straight up into the air at a speed of 20.0 m/s. Inthe process, he moves his hand through a distance of 1.50 m.If the ball has a mass of 0.150 kg, find the force he exerts onthe ball to give it this upward speed.An iceboat is at rest on a frictionless horizontal surface.Due to the blowing wind, 4.0 s after the iceboat is released, it is movingto the right at 6.0 m/s (about 22 km/h, or 13 mi/h). What constanthorizontal force FW does the wind exert on the iceboat? The combinedmass of iceboat and rider is 200 kg.
- nd has a two sur- Week 3 homeuric A 2 00 kg projechle fired at an angee or 20 what is the magnitude O the torce exei tecd onthe pr jectice when iş is at the nignest position Inits trajectory. Neglect any air resistance.The same rocket sled drawn is deceleratedat a rate of 196 m/s2. What force is necessary to producethis deceleration? Assume that the rockets are off. The massof the system is 2100 kg.As a fish jumps vertically out of the water, assume thatonly two significant forces act on it: an upward force F exertedby the tail fin and the downward force due to gravity. A recordChinook salmon has a length of 1.50 m and a mass of 61.0 kg.If this fish is moving upward at 3.00 m/s as its head first breaksthe surface and has an upward speed of 6.00 m/s after twothirdsof its length has left the surface, assume constant accelerationand determine (a) the salmon’s acceleration and (b)the magnitude of the force F during this interval.