Q1. A student used apparatus in to compare the energy needed to heat blocks of different materiale. Each block had the same mass Each block had a starting temperature of 20 °C
The student measured the time taken to increase the temperature of each material by 0 0
100
140
130
100
Time taken
in seconda
00
Tin
Concrete Copper Iron
Material
(1) Which material was supplied with the most energy?
Give the reason for your answer
(2)

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

Asmall grinding wheel has a moment of inertia of 4.0×10−5 kg⋅m2 . what net torque must be applied to the wheel for its angular acceleration to be 150 rad/s2 ?

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.