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A lifeguard is working at a pool sitting in his guard stand. He notices a child right below him drowning that appears to be 1.5 m below the surface of the water? How deep is the child actually? Suppose he is sees the child at a very small angle, and utilize the small angle approx. of sinθ= tanθ = θ
John weighs 716 N, and Marcia weighs 506 N. Estimate the gravitational force between them when they are 0.45 m apart
Calculate the entropy change for the following system: One kilogram of 80 C aluminum is placed into 2L of 20 C water in a container with negligible heat capacity and adiabatic walls. The water and aluminum reach thermal equilibrium. Assume specific h..
a basketball player throws a basketball m 1 kg straight up with an initial velocity of v0 6.5 ms. the ball leaves his
a moth at about eye level is 12 cm in front of a plane mirror you are behind the moth 34 cm from the mirror. what is
The normal force equals the magnitude of the gravitational force as a roller coaster car crosses the top of a 59-m-diameter, What is the car's speed at the top
If a roadway is banked at the proper angle, a car can round a corner without any assistance from friction between the tires and the road
A wheel rotating with a constantangular acceleration turns through 22 revolutions during a 3 s timeinterval. What is the angular acceleration of the wheel
A projectile is launched with an initial speed of 40.0 m/s at an angle of 30.0° above the horizontal. What is the straight-line distance from where the projectile was launched to where it hits its target
A dilute ideal gas of atoms each of mass M at temperature τ is placed in a cetrifuge rotating with angular velocity ω. Derive an expression for the relative density of gas molecules as a function of their radial distance r from the axis of rotation.
Two radio-frequency point sources separated by 1.5 m are radiating in phase with ? = 0.30 m. How many maxima does it detect
A building made with a steel structure is 596 m high on a winterday when the temperature is 0?F. How much taller is the building when the temperature is T = 104?F? (The linearexpansion coefficient of steel is α = 1.1 ×10−5 (?C)−1.)
a rotating sprinkler is placed in the vertex of apie-shaped plot of ground. if the sprinkler shoots the water out
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