Mechanics | Relativity Answers

The diagram shows a shell barrow, being held still,full of stones with a total mass of 43kg. What is the weight of the wheel barrow and stones?

a belt runs on a wheel of radius 30cm. During the that wheel coasts uniformly to rest from an initial speed of 2.0revs/s, 25m of belt length passes over the wheel. find the deceleration of the wheel and the number of revolutions it turns while stopping

a ring and a disc of same mass roll without slipping along a horizontal surface with same velocity. if the kinetic energy of ring is 8J then that of disc is

ans:6J

A 5.38 kg object falls freely (ignore air resistance), after being dropped from rest. Determine the final kinetic energy (in J) for the first meter of the fall.

1. What are the properties of two vectors a and b such that
(a) a+b = c
(b) a+b = a-b
(c) a+b = c and a^2 + b^2 = c^2
2. Given two vectors a = 3i + 2j, b = -1 + 7j. Find a vector c such that a+b+c = 0.
3. Consider two vectors, one of magnitude 3 units and the other of magnitude 4 units. Show how the displacement vectors may be combined to obtain a resultant displacement of magnitude.
(a) 7 units
(b) 1 unit
(c) 5 units

0.46KG block is held in place against a spring by a 30N horizontal external force. The external force is removed and the block is projected with a velocity v1 1.2m/s upon separation from the spring. The block descends a ramp and has a velocity v2 equal to equal 1.5m/s at the bottom. The track is frictional between point A and B. The block enters a rough section at B extending to E. The coefficient of kinetic friction is 0.38. The velocity of the block v3 is 1.4m/s at C. The block moves unto D, where it stops. Calculate the distance the block travel between point B to D

a spring streched by 3.0 from it relaxed length when a force of 7.5 is applied.a particle with mass of 0.050kg is attached to the free end of the spring which is then compressed horizantally by 5.0 from it relaxed length and realesed from rest at t=0? what is the spring constant

Q1.A square plate of uniform thickness and length of side 30 cm hangs vertically from hinges at its top edge. When a horizontal jet strikes the plate at its centre, the plate is deflected and comes to rest at an angle of 30 to the vertical. The jet is 25 mm in diameter and has velocity of 6 m/s. Calculate the mass of the plate and give the distance along the plate from the hinge, of the point at which the jet strikes the plate in its deflected position.
Help me please

A belt runs on a wheel of radius 30cm. During the time that wheel coasts uniformly to rest from
an initial speed of 2.0revs/s, 25 m of belt length passes over the wheel. Find the deceleration of
the wheel and the number of revolutions it turns while stopping.

A person of mass 64 kg climbs up a ladder to a height of 5.0 meters.

What work does the person do?

What is the increase in gravitational potential energy of the person at this height?

Where does the energy come from to cause this increase in P.E?