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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.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.A pitcher exerts an average horizontal force of 100 Non a 0.15 kg baseball during the delivery of the pitch.His hand and the ball move through a horizontaldisplacement of 1.5 m during this period of forceapplication.If the ball’s horizontal velocity was zero at the start ofthe delivery phase, how fast would the ball be goingat the end of the delivery phase when the pitcherreleased it?