A copper wire should be strung between two electric poles, which are 80 m apart. How big should it be? be the smallest length of the copper wire at temperature t1=30°C so that it does not tighten in winter, when will the temperature t2= 30° C? alpha= 1.7 * 10⁵ 1/°C
A copper wire should be strung between two electric poles, which are 80 m apart. How big should it be? be the smallest length of the copper wire at temperature t1=30°C so that it does not tighten in winter, when will the temperature t2= 30° C? alpha= 1.7 * 10⁵ 1/°C
Move over Jeff Bezos, this invention is about to make you the richest person in the world. You have just invented the OyOy (that's YoYo spelled backwards). It is the very latest in home safety and so easy to use! If your building is on fire, simply reach out and grab the cord on the OyOy and you will be lowered safely toward the ground at a low velocity. The OyOy has a total mass M = 95.0 kg and is shaped like a cylinder of radius R = 0.940 meters. The secret to the operation of the OyOy is its patented shaft whose radius is only r = 0.0900 meters. The cord is wound around the small shaft and this is the secret to your low velocity. We will use the approximation that the shaft is of negligible mass compared to the total. This means that you can treat the entire OyOy as though it is a solid cylinder with mass M and radius R. Imagine that a customer of mass m = 78.5 kg is using the OyOy and begins his decent from an initial height of y0 = 12.55 meters. Find velocity of customer at ground.
A 975-kg car accelerates from rest to 26.7 m/s in a distance of 120 m. What is the magnitude of the average net force acting on the car?
When a car moves at a speed of 80m/s² to the west and then 100m/s² to the west , what will be type of acceleration ? acceleration or deceleration.WILL MARK BRAINLIEST
Nabil wants to work out the density of a pebble. He has a displacement can and a beaker. What other piece of equipment will he need?
A magnetic field points out of the page with B = 0.75 T . The wire shown carries a current of 69 A and has a length of 30 cm . What is the force exerted on the wire?
Two forces, F1=(1.65i−0.90j+1.15k) N F2=(−1.00i+1.20j) N are applied on a moving object of mass 0.20 kg. The displacement vector produced by the two forces is d=(10.0i+8.8j+5.1k)m. What is the work done by the two forces? I need help with this question. please
a particle of weight w x hangs by a string from a point if f is the horizontal force that must be applied to the particle to make the string bang at angle 30 degree such so that f equals to w√3 ÷ 3
An airplane is traveling 835 km/h in a direction 41.5 ∘ west of north How far north and how far west has the plane traveled after 4.20 h ?
Can you make connections to how we can maximise the energy we receive from light using the principles learnt?
