A car with good tires on a dry road can decelerate at about 5.0 m/s2 when braking. Suppose a car is initially traveling at 55 mi/h. (a.) How much time does it take the car to stop? (b.) What is the stopping distance?
What will be an ideal response?
(a.) 4.9 s
(b.) 60 m
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The 100 Year Starship initiative aims to devise a plan for sending a crewed spacecraft to a nearby star
A) at a cost of less than a 100 billion US dollars B) with a travel time of one century or less C) within the next century D) a hundred light years distant
Listed following are characteristics of the atmospheres of Venus, Earth, and Mars. Match each atmospheric characteristic to the appropriate planet.
A 1000-kg car approaches an intersection traveling north at 20.0 m/s. A 1200-kg car approaches the same intersection traveling east at 22.0 m/s
The two cars collide at the intersection and lock together. Ignoring any external forces that act on the cars during the collision, what is the velocity of the cars immediately after the collision? A) 29.7 m/s in a direction 47.7° east of north B) 21.1 m/s in a direction 47.7° west of south C) 15.1 m/s in a direction 52.8° east of north D) 21.1 m/s in a direction 52.8° east of north E) 21.1 m/s in a direction 47.7° east of north
You are moving at a speed 2/3 c toward Randy when shines a light toward you. At what speed do you see the light approaching you?
A) 2/3 c B) 4/3 c C) c D) 1/3 c