Mechanics | Relativity Answers

An 0.007 kg bullet is fired into a 0.23 kg block that is initially at rest at the edge of a table of height h = 1.05 meter. The bullet remains in the block, and after the impact the block lands 1.84 meters from the bottom of the table. What is the initial speed of the bullet?

Suddenly you realize that a car is headed toward your car the wrong way in a one way tunnel. To minimize your danger from the impending accident, should you match your speed to that of the other car, go even faster, or slow to stop?

Which of the following is the correct unit of k in the equation of a damped harmonic oscillator given asЖ
−bv−kx=maб
where b is the damping factor and all the symbols have their usual meaning?
kgms−2
kgs−1
kgms−1
kgs−2

A man walks 4 km towards north in one hour and 3 km towards east in the next hour.What is his average speed?

if h1 and h2 are the greatest height of the projectile in two paths for a give value of range , then what is the horizontal range

Q. Why work done is vector quatity? But it is dot product of two vector quantities force and displacement

a rigid body exists in n dimensional space, how many co ordinates are needed to specify the position and orientation in this space

A canoeist can paddle a maximum speed of 6.4 m/s in still water. The canoeist starts on the north shore of the river and attempts to paddle to the south shore 225m away, the river is flowing 2.45m/s [E]. the canoeist always remains at a right angle to the north shore.
Determine the resultant velocity of the canoeist, relative to the shore.

An 800kg roller coaster car is launched horizontally from a giant spring (k = 35 kN/m), rolls 10 m and them goes thru a vertical loop of radius 7 m. If for every meter the car rolls on the track, thermal energy increases by 800 J, would compressing the spring 3 m give the car enough energy to safely get to the top of the loop?

Mario is doing pull-ups about 1 meter from the end of the hour hand of a clock on the Big Ben Tower in London.

Mario weighs 650N and the Hour hand weighs 5000N and is uniform in density. The time is 3pm. The Hour hand is 5 meters long. What is the net Torque around the pin that attaches the hour hand to the clock face?