(d) The student calculated the specific heat capacity of aluminium to be 2390 J/kg "c.
The 'true' specific heat capacity of aluminium is 900 J/kg °C.
Suggest why the student's result for aluminium is different from the 'true' value.

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)