HRS - Ask. Learn. Share Knowledge. Logo

Questions in physics

[Done] Where could convection currents form? A. in a sand dune B. on a pavement C. in the atmosphere D. in outer space

[Done] Given the cross-sectional areas of the small and large pistons in a hydraulic lift (0.25 m² and 5 m², respectively) and the mass of a car (1200 kg), calculate the force required to lift the car using Pascal's law.

[Done] A particle moves 4√2 m in South-West direction, 12 m in upward direction and then 1 m in East direction. Find the net displacement. A) 13 m B) 17 m C) 14 m D) 18 m

[Done] If a body of mass 4 kg is lifted to a height of 10 m and then released, what will be the velocity of the body when it strikes the ground? Options: 1. 10 m/s 2. 20 m/s 3. 14 m/s 4. 28 m/s

[Done] The radiosonde can be used to measure upper air temperature. Please select the best answer from the choices provided. A. True B. False

[Done] If an object has a mass of 20 kg, what's the force of gravity acting on it on Earth? A. 2.04 kg B. 196 N C. 32.67 N D. 1.96 kg

[Done] Calculate the coefficient of coupling between two coils, given that the mutual inductance (M) is 1.5 H and the self inductances are 5 H and 4 H.

[Done] True or False: Friction can be reduced by lubricating or changing the shape of objects.

[Done] D. solid foam. 8. A fire on an elevated object such as a wall or billboard is best attacked with A. roll-on B. rain-down C. bank-down/bounce-off D. drop down 9. Which element of the fire tetrahedron is not affected by a blanket of foam? A. Fuel

[Done] Which procedure could a student use to examine an intensive property of a rectangular block of wood? A. Find the mass. B. Record the length. C. Measure the volume. D. Determine the density.