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During lift off a rocket ship accelerates from rest to about 28,000 km/h and reaches an altitude of 300 km. What is the apparent weight of a 75 kg astronaut during this time (assume constant acceleration)? explain why does an astronaut feel weightless once in orbit? and state the newton law being used
a. the length of the arc
b. perimeter of the sector
2. The area of the sector which subtends an angle of x at the center of the circle of radius 5.2cm is 21cm square calculate:
a.the value of x
b.length of the arc
c. perimeter of the sector
3. The perimeter of the sector which subtends an angle of 105°at the center of a circle is 17.25m calculate:
a.radius of the circle
b.length of an arc and
c.area of the sector
Two particles P and Q move towards each other along a straight line MN, 51 meters long. P starts from M with velocity 5ms-1 and constant acceleration of 1ms-2. Q starts from N at the same time with velocity 6ms-1 and at a constant acceleration of 3ms-2.
Find the time when the :
A) particles are 30m apart
B)Particles meet
C) velocity of P is ¾ of the velocity of Q
1. If we tie a stone to a rope, and start to spin it in a horizontal circle, the tension in the rope is also known as ______________.
a. centripetal force
b. centrifugal force
c. gravitational force
d. Normal strength
2. When a body is in uniform circular motion, the speed that is tangent to the circular path is called ______________.
a. Angular velocity
b. Tangential speed
c. Centripetal acceleration
d. Centrifugal speed
3. For a body or object to stay in a circular path there must be a force with a ______________ direction of the circle
a. On the right
b. On the left
c. Into
d. Out
4. In circular motion, the time it takes to complete ______________ the circle is called a period.
a. Three laps
b. Two laps
c. Turn around
d. One round
5. The ______________ keeps the body accelerating towards the center of the circular path
a. Centripetal acceleration
b. Angular velocity
c. Tangential speed
d. Tangential acceleration
