Answer:
4. a = 2 m/s² 5. m = 20 kg
Explanation:
4.
Mass of the book, m = 2kg
The net force acting on the book, F = 4 N
Let a is the acceleration of the book. We know that,
F = ma
Put all the values,
So, the acceleration of the book is equal to .
5.
Kinetic energy of the car, K = 4000 J
Speed of the car, v = 20 m/s
We need to find the mass of the car. The formula for the kinetic enregy is given by :
So, the mass of the car is equal to 20 kg.
The correct terms to fill in the blanks are solid and gas. The strongest interparticle attractions exist between particles of a solid and the weakest interparticle attractions exist between particles of gas. In a solid substance, the atoms are very close to each other and collision frequency is very high, Thus, attraction between particles is high. For a gas, the molecules are very far from each other to the point that they do not collide. Collision frequency is very small for a gas leading to a weak attraction between particles. An intermediate phase of these two is called the liquid phase, where the particles are far apart but not that far where collisions are more likely to happen.
formula for wavelength = speed/frequency
So 1500/200 = 7.5 meters
Explanation:
We need to draw position-time graph when the speed is increasing.
The slope of position-time graph gives the speed of an object.
Position means distance covered.
When the speed of an object is increasing with time. It means it is moving with increasing speed.
The attached figure shows the position -time graph when speed is increasing.
Answer:
Explanation:
Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces. “