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Alyssa dropped the golf ball from the 5th floor of the hotel and hits the ground for 5 seconds later. How tall is a 5th floor hotel?
A piece of metal has a mass of 200 g in air and 170 g when immersed in water. Calculate its volume and density. [Density of water is 1000 kgm-3. Take g=9.8 ms-2 ]
Joanne drives her car with a mass of 1000 kg at a speed of 20 m/s. Show that to bring her car to a halt in 10 s, road friction must exert a force of 2000 N on the car.
Two spherical objects have masses of 7.5 x 108 kg and 6.5 x 108 kg. Their centers are separated by a distance of 2.5 x 106 m.
The resting potential of the crab limb nerve is 89 mV. What is the
concentration of potassium ions inside the nerve, if it is 12mmol/1 outside?
Take the temperature equal to 20°C
The resting potential of the crab limb nerve is 89 mV. What is the
concentration of potassium ions inside the nerve, if it is 12mmol/1 outside?
Take the temperature equal to 20°C
An object which is electrically neutral contains only neutrons.
the earth pulling down on a 12kg rock during the 3.0s it takes to fall a cliff?
Calculate the mass of a steel plate with a specific heat capacity of 650 J/kg °C, taking into
consideration the steel plate was heated up with a cutting torch while cutting to 925 °C, and was
quenched in 25 It of water with an initial temperature of 22 °C and a specific heat capacity of
3850 J/kg °C. Both the water and the steel plate reached a final temperature of 32 °C. Here we
assume that there was no heat loss. Indicate what info was given, show all formulas and steps.
A basketball floats in a bathtub of water.
The ball has a mass of 0.5 kg and a diameter of 22 cm.
(a) What is the buoyant force?
(b) What is the volume of water displaced by the ball?
(c) What is the average density of the basketball?
You can use
g
= 9
.
8 m/s
2
.
