Other Physics Answers

A projectile moves in a parabolic path without air resistance. Is there any point at which a parallel to v? perpendicular to v? Explain.

The boat is heading due north as it crosses a wide river with a velocity of 10 km/h relative to water. The river has a maintain velocity of 5 km/h due east. Determine the velocity of the boat with respect to an observer on the riverbank.

A railroad flatcar is travelling to the right at speed of 13 m/s relative to an observer on the ground. Someone is riding a motor scooter on the flatcar. What is the velocity of motor scooter relative to the flatcar if its relative velocity to the observer on the ground is (a) 18 m/s to the right? (b) 3 m/s to the left? (c) zero?

The compass of an airplane indicates that it is headed towards north, and its airspeed indicator shows that it is moving through air at 240 km/h. If there is wind of 100 km/h from west to east, what is the velocity of the airplane relative to earth?

 A dog running in an open field has components of velocity Vx = 2.6 m/s and Vy = -1.8 m/s at time t = 10 sec. The dog is running with constant acceleration of 0.45 m/s2 and direction 31.0º measured from +x-axis. At 20 sec, (a) what are the x- and y-components of dog’s velocity? (b) What are the magnitude and direction of dog’s velocity? 

A jet plane is flying at a certain altitude. At time t1 = 0, it has components of velocity Vx = 90 m/s, Vy = 110 m/s. At time t2 = 30 sec, the components are Vx = -170 m/s, Vy = 40 m/s. Calculate (a) the components of average acceleration, (b) the magnitude and direction of average acceleration.

A rhinoceros is at the origin of coordinates at t1 = 0. For the time interval from 0 to 12 sec, the rhino’s average velocity has x-component -3.8 m/s and y-component 4.9 m/s. At t2 = 12 sec, (a) what are the x- and y-component of the rhino’s position? (b) How far is the rhino from the origin?

A squirrel has x- and y-coordinates (1.1 m, -0.5 m) at time t1 = 0 sec and coordinates (5.3 m, 3.4 m) at time t2 = 3.0 sec. For this interval, find (a) the components of average velocity; (b) the magnitude and direction of average velocity.

A jet plane is flying at a certain altitude. At time t1 = 0, it has components of velocity Vx = 90 m/s, Vy = 110 m/s. At time t2 = 30 sec, the components are Vx = -170 m/s, Vy = 40 m/s. Calculate (a) the components of average acceleration, (b) the magnitude and direction of average acceleration.

What mass of ice -14⁰c Will Be needed to cool 200cm² Of an orange drink (essential water) from 25⁰C to 100^0c