Top answers

Calculate the temperature rise of a mass due to energy transfer over time.

Specific question: The hot tub system has a volume of 4.5 m3 and is filled with water at a temperature of 28 °C. The heater transfers thermal energy to the water at a rate of 2.7 kW while a pump circulates t...
DS
Answered by Denis S. • Physics tutor
19243 Views

A ball of mass m is thrown from the ground at the speed u=10ms^-1 at an angle of 30 degrees. Find the max height, the total flight time and the max distance it travels?Assume g=10ms^-1 and there is no air friction

First let’s split the problem into 2 parts: Vertical(y direction) and Horizontal(x direction.Vertical: u_y = 10 sin (30) = 5ms^-1 As for the ball to stop at max height and the fall down, all the kinetic ener...
MV
Answered by Mihai V. • Physics tutor
2697 Views

A person swims from a depth of 0.50 m to a depth of 1.70 m below the surface of the sea. density of the sea water = 1030 kg/m^3 gravitational field strength = 9.8 N/kg Calculate the increase in pressure on the swimmer. Give the Unit.

ΔP = Δh ρ g Δh = 1.7 - 0.5 = 1.2 m ρ = 1030 kg/m 3 g = 9.8 N/kg ΔP = 1.2 (m) x 1030 (kg/m 3 ) x 9.8 (N/kg) = 12,112.8 N/m 2 = 12,112.8 Pa
EP
Answered by Elliot P. • Physics tutor
8515 Views

Draw the I-V curves of both an ideal resistor and a filament bulb. Explain the key features of both.

Plot: I-V curve of an ideal resistor is a straight line with a positive gradient passing through (0,0)The I-V curve of an ideal resistor is a straight line because ideal resistors strictly obey Ohm's law (V ...
JA
Answered by Jacob A. • Physics tutor
10613 Views

What is resistivity in S.I. units?

First, we know our equation for resistivity rho = RA/L. We know that L and A are in [m], which are already in SI units - however, [ohms] are not SI units. We do know, however, we know that R = V/I, and that ...
LU
Answered by Laura U. • Physics tutor
3896 Views