D. 7. What Newton's law of motion requires the use of seat belt in cars? A. Law of Inertia B. Law of Interaction C. Law of Acceleration Law of Universal Gravitation
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- a. An object that is free-falling is acted upon by the force of gravity alone. b. A falling skydiver which has reached terminal velocity is considered to be in a state offree fall. c. A ball is thrown upwards and is rising towards its peak. As it rises upwards, it is NOT considered to be in a state offree fall d. An object in free fall experiences an acceleration which is independent of the mass of the object. e. A ball is thrown upwards, rises to its peak and eventually falls back to the original height. As the ball rises, its acceleration is upwards; as it falls, its acceleration is downwards. f. A ball is thrown upwards, rises to its peak and eventually falls back to the original height. The speed at which it is launched equals the speed at which it lands. (Assume negligible air resistance.) g. A very massive object will free fall at the same rate of acceleration as a less massive object.5. A ball is thrown with an initial velocity of 8.5 m/s at an angle of 30.0⁰ from the horizontal. How long the ball is in flight? (assume g = 9.81 m/s²) 6. The planet A has a mass of 1.972-1024 kg and the planet B has a mass of 5.348-1024 kg. What is the distance between the planet A and planet B if the force of gravity between them is 2.111-1022 N?. (assume G = 6.670-10-¹¹ Nm²/kg²) 1770What is the gravitational force that two 70 kg people exert on each other when standing 15 m apart? O A. 1.67x10-9 N O B. 2.22x10-11 N O C. 6.67x10-11 N O D. 2.50x10-8 N
- Newton's Laws SET-UP #1: Object with weight W supported by 2 cords as shown. Quantities to Measure: T₁ = -2.2 NOTE: W = mg _N; 01 = NOTE: T₁x = T₁SinØ₁ T₁y = T₁CosØ, T₂x = T₂Sin0₂ T₂y = T₂CosØ2 02 = T2 40 70 02 1. Draw a pseudo-FBD showing the x and y components of T1 & T2.What happens to a car traveling on a spiral path, toward the center, if its speed stays the same the whole time? and why ? a. the acceleration increases b. Its centripetal force gets bigger c.Its centripetal force gets smaller d.Its acceleration decreases