The position in metres (as a function of time, in seconds) for a particle moving along the x-axis is given by x(t) = t
4
-2t
3 + 9t- 5. Find

(a) the instantaneous velocity of the particle at t1 = 4.00 s
(b) the instantaneous acceleration of the particle at t1 = 4.00 s

Arocket starts from rest and moves upward from the surface of the earth. for the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay = 12.80 m/s32t, where the +y-direction is upward. (a) what is the height of the rocket above the surface of the earth at t = 10.0 s? b) what is the speed of the rocket when it is 325 m above the surface of the earth?

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point

An alarm clock has a current of 4.5 amps and a resistance of 3.2 ohms. what is the voltage in the circuit? a.1.4 volts b.0.71 volts c.14 volts d.46 volts