À body falling from a vertical height of 10 m pierced through a distance of 1 m in sand. It faced an average retardation in sand amounting

Q: A person with a muscle cramp in shallow water should try to relax the muscle by stopping the…

A: Muscle cramps are common among swimmers. To relieve muscle cramp, one should can stop the activity…

Q: An air-plane has an effective wing surface area of 16.5 m² that is generating the lift force. In…

A:

Q: A lady wearing high heel shoes balances on a single heel. The heel is circular with a diameter 0.8…

A: Let m be the mass of the lady diameter of heel, d = 0.8 cm

Q: Why is a high mountain composed mostly of lead an impossibility on Earth?

A:

Q: A spring is attached to the bottom of an empty swimming pool, with the axis of the spring oriented…

A: Given: mass of block of wood=8.3 kg density of block=670 kg/m3

Q: Q37. Water jet of an area of cross-section 2 cm strikes the wall normally with a velocity of 20 m/s…

A: Due to the force exerted by the wall on the water, the water's velocity changes from 20m/s to zero.…

Q: Akiko Tam, a swimming champion whose mass is 60 kg stands on a rectangular swimming raft 3.0 m long…

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Q: A rectangular-shaped swimming pool has dimensions of 15m by 30m and is 3.5m deep. When the pool is…

A:

Q: What volume of Styrofoam woukd have the same mass as 1.0m of seawater? (Prwwuter 10 kg/m) = 1.03 x O…

A:

Q: An airplane wing is designed so that the speed of the air across the top of the wing is 251 m/s when…

A:

Q: Seawater is stored under pressure in a tank of horizontal cross-sectional area 4.5 m^2. The pressure…

A:

Q: A person who is 30 m under water will experience more pressure than a person 40 m underwater more…

A: In fluids pressure increases with depth. If depth increases pressure also increases

Q: It is difficult to run faster on sand. Why?

A: Running on sand puts extra pressure on the knees, ankles, Achilles tendons, and hips. Time your runs…

Q: A large water tank is filled to a depth of 12.7 m. A leak develops in the side of the tank and water…

A:

Q: A block of wood with the dimensions 0.2 x 0.3 x 0.5 cubic meters floats along a river with the…

A: Given data:  Dimensions of block= 0.2×0.3×0.5 cubic meters Floats on river, broadest face facing…

Q: A small plane, traveling at constant speed, has an air flow of 70.0 m/s  through above the wing and…

A: Calculate the pressure difference between upper and lower side of the wing. P1 - P2 = 0.5*​ρ(V22 -…

Q: When the branch of a tree is shaken , fruit falls. Why?

A: Tree and the hanging fruit are in the state of rest initially. When the branch is shaken vigorously,…

Q: A 13 cm radius air duct is used to replenish the air of a room 9.1m×5.5m×3.8m every 17 min. How fast…

A: Given information: Here, r is the air duct’s radius, V is the room’s volume and t is the time…

Q: The vertical motion of the ship up and down caused by seawater is known as: Yawning Pitching Heaving…

A: The vertical motion of a ship up and down caused by sea water

Q: A jet airplane in level flight has a mass of 8.64 104 kg, and the two wings have an estimated total…

A: Apply the Bernoulli’s equation at the top and the bottom side of airplane.

Q: A wire 2 m long and 2 mm in diameter, when stretched by weight of 8 kg has its length increased by…

A:

Q: A water tank open to the atmosphere at the top has two small holes punched in its side, one above…

A:

Q: A barge floats in the Atlantic Ocean (salt water with a density of 1025 kg/m3). If the barge is a…

A: density of salt water (d) = 1025 kgm3Width of box (w) = 11.2 m Length (L) = 18.1 m Height (H) = 3.84…

Q: A small plane that travels with constant speed, has a mass m = 1643 kg. This includes load. The…

A: Given: Mass = 1643 kg Area of both wings = 20.5 m2 Speed of air below wind = 147 m/s Air density =…

Q: At a depth of 1000 m in an ocean. Find the force acting on the window of area 20 cm × 20 cm of a…

A: The pressure on the window of the submarine is the difference between the pressure outside the…

Q: A piece of metal is released under water. The volume of the metal is 50.0 cm and its specific…

A:

Q: A wooden spherical ball with specific gravity of 0.45 and a diameter of 400mm is dropped at a height…

A: ball with specific gravity of 0.45diameter of 400mmheight of 5.2m density of wood=450 kg/m3

Q: A barge floats in the Atlantic Ocean (salt water with a density of 1025 kg/m3). If the barge is a…

A:

Q: A barge floats in the Atlantic Ocean (salt water with a density of 1025 kg/m³). If the barge is a…

A: Density of salt water = 1025 kg/m3  dimensions of barge = 10.4 m × 17 m × 3.67 m  Mass of barge =…

Q: What type of gases exert a downward force on the Earth's surface due to gravity?

A: Downward force exerted by an object due to its mass is given by F=mgwhere, m =mass of object…

Q: The value of relative permeability of the cast- steel core of figure Q5 is? A = 2 × 10-³ m² N =200…

A: = 4 x 10-4 Wb  A = 2 x 10-3 m2  N = 200 turns  l = 0.16 m To find = Relative permeability ()

Q: A composite material with a bulk modulus of 4.50x109Pa is made in the shape of a cube 1.50cm on a…

A:

Q: Why were so many vertical columns needed to support the roofs of stone buildings?

A: Stones were the only raw material for construction in ancient Egypt and Greece. But as stones are…

Q: An abject weighs 10 N in air. When immersed fully in liquid, it weighs only 7 N. The weight of the…

A:

Q: The force of friction between two surfaces will increase if:   A) a layer of lubricant is kept…

A: Introduction: Frictional force is defined as the resistive force when there is relative motion…

Q: Water is more elastic than air. Why?

A: The object with greater bulk modulus of rigidity is more elastic. Bulk modulus of elasticity is…

Q: A fisherman and his buddy climb into a flat-bottomed aluminum fishing boat has a mass of 60 kg and…

A:

Q: If an empty cylinder is half filled with a liquid, its center of gravity is:    A) shifted upwards…

A: Center of gravity is known as the point of the object where weight is evenly dispersed  means all…

Q: How come our feet hurt when we run on a sturdy ground compared to running in soft ground? Select the…

A: When we jump on study surface, our feet are brought to rest almost instantaneously. Thus time taken…

Q: The top surface of a road is built in the shape of a parabola to allow water to drain away on either…

A: Given data: The top surface of the road built in the shape of a parabola. The width of the road is,…

Q: Why is a soft, underinflated football at sea level much firmer when it is taken to a high elevation…

A: The atmospheric pressure at high altitude is low as compared to the sea level. Thus, the relative…

Q: A raft is 4.2 m wide and 6.5 m long. When a horse is loaded onto the raft, it sinks 3.0 cm deeper…

A: Answer             W  = 8026.2 N

Q: The pressure at equal depths within a uniform liquid is: a) the same b) increase c) decrease d) the…

A:

Q: When you are sunbathing on a stony beach, why do the stones hurt your feet less when you’re standing…

A: When the person is standing on a stony beach, the person exerts a pressure downwards. There exists…

Q: A glass window has the shape of a trapezoid with height 4m, width at the top of 5m, and width at the…

A: Height of trapezoid = 4 m Width of top side, s1 = 5 m Width of bottom side, s2 = 8 m Water depth = 3…

Q: Which has more skin, an elephant or a mouse? Which has more skin per unit of body weight, an…

A: Out of the Elephant and the mouse, Elephant has more skin as it is larger in size.

Q: A 7m diameter hot air balloon is neither rising nor fallinf. The density of atmospheric air is 1.3…

A: This is a problem based on the buoyancy force. The weight of the people and ballon must have to be…

Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!