Physics Practice Questions

What is the density of a 200 g object that occupies 50 cm³? Density = Mass / Volume = 200 g / 50 cm³ = 4 g/cm³ A block has a volume of 150 cm³ and a density of 2.5 g/cm³. What is its mass? Mass = Density \* Volume = 2.5 g/cm³ \* 150 cm³ = 375 g What is the volume of a liquid with a mass of 500 g...

What is the density of a 200 g object that occupies 50 cm³? Density = Mass / Volume = 200 g / 50 cm³ = 4 g/cm³ A block has a volume of 150 cm³ and a density of 2.5 g/cm³. What is its mass? Mass = Density \* Volume = 2.5 g/cm³ \* 150 cm³ = 375 g What is the volume of a liquid with a mass of 500 g and a density of 0.8 g/mL? Volume = Mass / Density = 500 g / 0.8 g/mL = 625 mL If 200 g of salt is dissolved in 2 L of water, what is the concentration in g/L? Concentration = Mass / Volume = 200 g / 2 L = 100 g/L A car travels 240 km in 3 hours. What is its speed? Speed = Distance / Time = 240 km / 3 h = 80 km/h A runner moves 400 m in 50 s. What is their average speed? Speed = Distance / Time = 400 m / 50 s = 8 m/s A plane accelerates from 100 m/s to 200 m/s in 5 seconds. What is its acceleration? Acceleration = (Final Velocity - Initial Velocity) / Time = (200 - 100) / 5 = 20 m/s² An object falls freely for 4 seconds. What is its velocity just before it hits the ground? (g = 9.8 m/s²) Velocity = g \* Time = 9.8 m/s² \* 4 s = 39.2 m/s How long does it take for an object to fall 78.4 m? (g = 9.8 m/s²) Time = √(2 \* Distance / g) = √(2 \* 78.4 / 9.8) = 4 s A cyclist accelerates at 2 m/s² for 5 seconds. If the initial velocity was 10 m/s, what is the final velocity? Final Velocity = Initial Velocity + (Acceleration \* Time) = 10 + (2 \* 5) = 20 m/s A force of 30 N is applied to a 5 kg object. What is its acceleration? Acceleration = Force / Mass = 30 N / 5 kg = 6 m/s² A 10 kg object moves at 5 m/s. What is its momentum? Momentum = Mass \* Velocity = 10 kg \* 5 m/s = 50 kg·m/s A force of 50 N is applied to a 2 kg mass for 3 seconds. What is its impulse? Impulse = Force \* Time = 50 N \* 3 s = 150 Ns An object moves with a velocity of 20 m/s and has a momentum of 100 kg·m/s. What is its mass? Mass = Momentum / Velocity = 100 kg·m/s / 20 m/s = 5 kg A hydraulic lift uses a small piston with an area of 0.01 m² to lift a car with a large piston of 1.5 m². If a force of 100 N is applied to the small piston, what is the force on the large piston? 15,000 N What is the pressure exerted by a 500 N force applied to a 2 m² area? Pressure = Force / Area = 500 N / 2 m² = 250 Pa A tank has a pressure of 2,000 Pa and an area of 5 m². What is the force acting on it? Force = Pressure \* Area = 2,000 Pa \* 5 m² = 10,000 N A 2 kg object at 80°C is dropped into 500 g of water at 20°C. If no heat is lost, what is the final temperature? (Specific heat of object = 0.5 J/g°C, specific heat of water = 4.18 J/g°C) Use: m1c1((Tf-T1) = m2c2(T2-Tf)