Physics Answers

An aeroplane starting to fliy 300km at point A ,then 250 km at 30°west of north,the 150 km north to arrive at B . Calculate the vector position in each displacement in unit vector notation

A wooden cube with weight of 700 N is floating on water. The density of wood = 0.7 x density of water. Calculate the upthrust.

A) 1000 N

B) 700 N

C) 490 N

D) More information is needed.

2.A boy rolls a ball on the table that is 0.85m high.If the boy hits the ball at 4m/s.How far the ball will travel from the base point of the table?

Let B = 5.30 m

 at 60.0°. C

 and A

 have equal magnitudes. The direction angle of C

 is larger than that of A

 by 25.0°. Let A · B = 27.0 m²

 and B · C = 34.5 m².

 Find the magnitude (in m) and direction (in degrees) of A.

If the initial speed of an object is 35m/s, what will the speed of the object be after 2s at an acceleration of 15m/s

4kg of water at 50°C is poured on a large block of ice at 0°C. How much I've melts. Specific heat capacity of water= 4200J/Kg/°C. Latent heat of fusion of ice= 3.33x10^5J

A uniform ladder weighing 100 N leans against a smooth vertical wall such that it makes a slope of 1:4. A human stands 2 meters up the ladder and has a mass of 70 kg. If the ladder is 5 m long, Find:

A. The force exerted by the wall on the ladder.

B. The magnitude and direction of the resultant force exerted by the floor on the lower end of the ladde

Consider the vectors, 𝑎⃗ = 5.0𝑖̂+ 4.0𝑗̂− 6.0𝑘̂, 𝑏⃗⃗ = −2.0𝑖̂+ 2.0𝑗̂+ 3.0𝑘̂ and 𝑐⃗ =

4.0𝑖̂+ 3.0𝑗̂+ 2.0𝑘̂.

1.1. Find the vector perpendicular to 𝑎⃗ and 𝑐⃗.________________________________________

1. The number of Bacteria in a particular colony is found to double every 2.25 seconds. If the initial count of bacteria is 12500, what will be the population after 125 seconds?

2. The distance covered by a freefalling object under the action of constant action of gravitational field quadratically varies with time. In a time of 3.0 seconds, a free-falling object covers a 5.0-meter distance. what distance will it cover in 5.0 seconds?

calculate the zero point energy of a system consisting of a mass of gm connected to a fixed point by a spring which is stretched 1cm by a force 1000 dynes the particle being constrained to move only along x axis