A lorry with a mass of 5000kg accelerates to overtake a caravan on the motorway. Its acceleration is 1.5m/s². What force must the engine be providing? You can ignore the effects of friction and air resistance

Suppose you have two meter sticks, one made of steel and one made of invar (an alloy of iron and nickel), which are the same length (1.00 m) at 0°C. The coefficients of volume expansion for steel and invar are 3.6 * 10-5 / °C and 2.

What kind of reaction involves burning?

Which of the following will cause acceleration? A. maintaining constant velocity B. moving in one direction only C. the presence of unbalanced forces acting on an object D. two forces of equal magnitude and opposite directions acting on an object

The cause of change in momentum is: change in inertia impulse change in force energy

All such substances which are used by humans for their survival and welfare are called?

When blue light of wavelength 450 nm falls on a single slit, the first dark bands on either side of center are separated by 45.0

An object is moving east, and its velocity changes from 65 m/s to 25 m/s in 10 seconds. Which describes the acceleration? 4 m/s2 in negative acceleration 4 m/s2 in positive acceleration 9 m/s2 in positive acceleration 9 m/s2 in negative acceleration

Two students walk in the same direction along a straight path at a constant speed-one at 0.90 m/s and the other at 1.90 m/s. •How far would the students have to walk so that the faster student arrives 5.50 min before the slower student? A.) 460s B.

During the process of accretion, each planet-in-the-making, or proto-planet, grew in size and mass. The amount of gravity for the proto-planets is best represented by which graph?

Theories and Laws. • How are they alike? • How are they different? • Can you explain why scientific theories will change over time? • Give an example of a scientific theory that has changed.