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Q. A dynamite blast at a quarry launches a chunk of rock straight upward, and 1.6 s later it is rising at a speed of 20 m/s. Assuming air resistance has no effect on the rock, calculate its speed at (a) at launch and (b) 5.5 s after the launch.
Q. A stone is dropped from the top of a cliff at t=0. The splash it makes when striking the water below is heard 6 seconds after it is dropped (i.e. at t=6 sec). How high is the cliff? (i.e. find 'h') Assume that the speed of sound in air is 340m/s and g = 9.8 m/s2.
A pendulum consists of a 4.98kg mass on the end of a 0.873 m string. The mass is pulled aside so the string makes an initial angle with the vertical of 12.5o. The mass is then released with initial speed of 2.10m/s upward and perpendicular to the rop..
In a bicycle race, the leader is travelling with a constant velocity of 11.10 m/s and is 10.0 m ahead of the second-place cyclist. The second place cyclist has a velocity of 9.50 m/s and an acceleration of 1.20 m/s squared. How much time elapses b..
Find out h orizontal angle of projectile
A boy whirls a stone using an r-m long string in a horizontal circle h m above the ground. The string broke, and the stone flies off horizontally and strike the ground x m away.The velocity with which the stone flies off the circle is? The centrip..
The reflected sound is afterwards mixed with the transmitted sound, and 85 beats per second are detected. The speed of sound in body tissue is 1520m/s. compute the speed of the fetal heart wall at the instant this measurement is made.
The truck slows down uniformly with an acceleration of 5.60 m/s2 for 4.20 s, making skid marks 62.40 m long that end at the tree. With what speed does truck then strike the tree.
A car is driven 155 km west and then 75 km southwest. What is the displacement of the car from the point of origin (magnitude and direction).
Two crewmen pull a boat through a lock. One crewman pulls with a force of F1 = 130 N at an angle of = 37° relative to the forward direction of the raft.
Two ants race across a table 56 cm long. One travels at 4.5cm/s and the other at 2cm/s. When the first one crosses the finish line how far behind is the second one.
A frictionless block of mass 1.95 is attached to an ideal spring with force constant 340 . At the spring is neither stretched nor compressed and the block is moving in negative direction at a speed of 12.6.
What are sunspots and how are they related to the Sun's magnetic field? Is the magnetic field stronger weaker in sunspots? How does the temperature in a sunspot relate to the temperature in the rest of the photosphere.
What least heat is needed to bring 80 of water at 20 to the boiling point and completely boil it away? (answere in Joules).
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