Physics Answers

A cable exerts a constant upward tension of magnitude 2.5 x 10⁴ N on a fully loaded elevator with a mass of 1.8 x 10³ kg as it rises to a vertical distance of 25.5 m.

(a) Find the work done by the tension force on the elevator.

(b) Find the work done by the force of gravity on the elevator.

(c) Find the power of motor if it takes 12 seconds in moving the elevator car.

Christmas ball in a shape of a hollow sphere is hung from the tree by a

piece of thread attached to the surface of the ball. The mass and radius of

the ball are 0.105kg and 0.12m, respectively. What will be its period of

oscillation when slightly displaced from its equilibrium position? (Hint: /5/3mr2

The author's home (4 people) used 4 m ^3 of water over a 9 day period . What does this equate to in Litres per person per day?

The human body has an average specific heat capacity of 3500 J /(kg °C). If a 65 kg physics student drinks a can of coke (200 Cal ; 1Cal = 4186 J ) and all of its energy is converted to thermal energy , by how much would body temperature increase?

Two balloons have equal and opposite charges. Balloon one has N = 10⁸ excess electrons. The balloons are separated by d = 1.3 m and each electron has a negative charge of e = 1.602 × 10^-19 C.

You

A 1200 kg car moving at 12m/s applies it's break and stops . If the brakes are made of 5 kg of steel ( C = 450 JK ^-1 Kg^-1) each for 4 brakes ,by how much does the temperature of the metal rise ?

a motorcyclist is moving at ( N+30) m/s when the rider applies the brakes giving the motorcyclist a constant deceleration of 5 meter per square . what distance does the motorcycle travel from the instant braking begins until the motorcyclist stops ?

A piece of substance of specific heat capacity 450JKg-1K-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance hitting the ground when it's energies are converted into heat

A 1Kg object is tied with a 2m rope and making uniform circular motion on the horizontal surface. the coefficient of friction is 0.2. if the rope can succeed maximum tension of 20N, what is the maximum velocity of the object

A cheetah can accelerate from rest to a speed of 30.0 m/s in 7.00 s. What is its acceleration in m/s²? Use Two Significant Figures in your answer