Physics Kinematics Level: High School
A car traveling at 20 m/s is brought to a halt by applying the brakes in 4s , what is the magnitude of acceleration of the car ?a) 4 m/s^2
b) 3 m/s^2
c) 5 m/s^2
d) 2 m/s^2
Physics Heat & Thermodynamics Level: High School
Thermal Expansion
A steel meter rod reads the correct length of objects at 20 degrees C . If the temperature , of the steel rod , increase to 30 degrees C and the scale is used to measure the length of an object , it will :a) Underestimate the actual length of an object
b) Give the correct length of the object
c) Overestimate the actual length of an object
Physics Work,Power & Energy Level: High School
Conservation of Energy
A simple pendulum with a bob of mass 250 g and length 2.0 m is allowed to fall from a horizontal position . What is the speed of the bob as it passes the lowest point ? (assume g = 9.8 x m/s^2 )a) 6.3 m/s
b) 39 m/s
c) 9.8 m/s
d) 4.9 m/s
Physics Properties Of Matter Level: High School
Elasticity
A cylindrical specimen of steel of cross-sectional area 5 cm^2 is objected to a tensile force of 800 N . The stress in the material is :a) 3.2 x 10^6 N/m^2
b) 8.0 x 10^3 N/m^2
c) 4.0 x 10^3 N/m^2
d) 1.6 x 10^6 N/m^2
Physics Heat & Thermodynamics Level: High School
A temperature of -162 degrees C corresponds to :a) -111
b) 162
c)-162
d) 111
Physics Ray Optics Level: High School
Completely polarized light passed through a polarizing sheet . The light that passes through has an intensity of 50% of the incident beam . The angle between the direction of polarization of the incident beam and the direction of polarization of the sheet must be .a) 30 degree
b) 45degree
c) 90 degree
d) 60 degree
Physics Rotational Mechanics Level: High School
Find the kinetic energy of a cylindrical shaft of mass 2.0 kg and radius 10 cm rotating about its central axis at 600 rad/s .a) 1800 J
b) 18000 J
c) 1200 J
d) 12000 J
Physics Work,Power & Energy Level: High School
The unit of work is ?a) kg m^2/s^2
b) kg m/s
c) kg m^2/s
d) kg m/s^2
Physics Force & Laws Of Motion Level: High School
A safe with a mass of 150 kg is at rest on the floor , what is the minimum horizontal force needed to move the safe if the coefficient of static friction between the safe and the floor is 0.3 ? (assume g = 9.8 m/s^2)a) 441 N
b) 501 N
c) 51 N
d) 41 N
Physics Vectors Level: High School
A person moves 30 m North , then 20 m East , and then 45 degree south of west . His displacement from the original position is :a) 10 m west
b) 15 m east
c) 28 m south
d) 14 m south-west
Physics Heat & Thermodynamics Level: High School
The specific heat of a gas at constant pressure is 1.70 times the specific heat at constant volume . Find the specific heat at constant pressure . (Universal gas constant R = 8.31 J/(mol K)a) 20.2 J/(mol K)
b) 12.5 J/(mol K)
c) 24.03 J/(mol K)
d) 18.0 J/(mol K)
Physics Heat & Thermodynamics Level: High School
A steel aircraft carrier is 368 m long when moving through the icy North Atlantic at a temperature of 2.5 degrees C . By how much does the carrier lengthen when it is traveling in the warm Mediterranean Sea at a temperature of 18 degrees C ?
Physics Properties Of Matter Level: High School
Thermal Expansion
A thin rod contains of two parts joined together . One-half of it is silver and one-half is gold . The temperature decreases by 24 degrees C . Determine the fractional decrease in the rod’s length using the formula ‘delta LI(Lo, sivlever + Lo,gold) , Where ‘Lo, silver’ and ‘Lo, gold’ are the initial lengths of the silver and gold rods .)
Physics Properties Of Matter Level: High School
Thermal Expansion
A rod made from a particular alloy is heated from 23.5 degree to the boiling point of water . Its length increases by 8.51 x 10^-4 m . The rod is then cooled from 23.5 degrees C to the freezing point of water . By how much does the rod shrink ?
Physics Properties Of Matter Level: High School
A container has a large cylindrical lower part with a long thin cylindrical neck ( see the figure at ‘click here’ ) The lower part of the container holds 12.5 m^5 of water and the surface area of the bottom of the container is 5.00 m^2 . The height of the lower part of the container is 2.50 m and the neck contains a column of water 8.50 m high . The total volume of the column of water in the neck is 0.200 m^3 . What is the magnitude of the force exerted by the water on the bottom of the container ?