middle school science help

Question: 1 newton = ________ 1. 2. 3. 4. Answer: ..

Force of Attraction Between Two Bodies of Mass m Separated by a Distance 3d That is, when the distance is doubled, the force will be reduced to 1/4 t h of the original value of force and when the distance is increased three times, the force will be reduced to 1/9 t h of the original val..

Consider a particle moving along a straight line with uniform acceleration 'a'. At t = 0, let the particle be at A and u be its initial velocity and when t = t, v be its final velocity. v = u + at I equation of motio..

Question: SI unit of acceleration is __________. 1. 2. 3. 4. Answer: ..

Question: Identify the v- t graph representing uniform velocity. 1. 2. 3. 4. Answer: ..

Question: What is the wavelength of sound waves produced in air by a vibrating tuning fork whose frequency is 256 Hz when the velocity of sound in air is 330 m s - 1 ? Answer: v = f 330 = 256 = = 1.3 ..

W = F x S Force acting on the object is given by F = mg [Newton's second law of motion] Mass of the object (m) = 5 kg Distance moved = 2m Therefore, Work done = F x S = 98 J 02. How much work is done, when a force of 25 N displaces an object through 10 m, in the direction of the force ap..

Question: The figure below shows the v-t graph of a car of mass 1500 kg. Calculate the retarding force. Answer: Retarding force F = ma Mass of the car m = 1500 kg We have to calculate a. The acceleration is zero till 20 seconds. =1500 x -4 = - 6000 N Retarding force = + 6000 ..

Question: Determine the magnitude of the linear momentum of a 200 g hockey puck travelling at a speed of 108 km/h. Answer: Linear momentum = mv Mass of the hockey puck = 200 g. Velocity of the hockey puck = 108 km/h Linear momentum = mv = 0.2 x 30 = 6 kg m/..

Question: Compare mixed cropping and intercropping. Answer: Comparison between mixed cropping and intercropping ..