In each cycle, a heat engine receives an input of 1540 J of heat and exhausts 1030 J of heat. What is the thermal efficiency?

0.274

0.456

0.669

0.331

A hockey player swings her hockey stick and strikes a puck. According to Newtons 3rd law of motion which of the following is a reaction to the stick pushing on the puck

What power of an engine is required to pump 2450N of water per second from a well 50m deep to the surface A. 2.45*10^3watts B. 2.45*10^4watts C. 2.45*10^5watts D. None of these

What force acting on an object would be considered a distant force? 1) applied 2) gravity 3) normal 4) spring

Pikes Peak near Denver, Colorado, has an elevation of 14,110 ft. Calculate the pressure at this elevation using three different methods. (a) Determine the pressure at this elevation using the standard atmosphere equation.

The electric field that is 0.25m from a small sphere is 450n/c toward the sphere. a. Is the charge positive or negative? Why? b. What is the magnitude of the charge on the sphere?

As stream velocity decrease, which factor will likely increase? A) erosion of the stream bank B) deposition of material in the stream C) amount of material carried downstream D) size of the particles carried downstream

What cells in the nervous signals travel through the nervous system

A mechanic pushes a 3.60 ✕ 103-kg car from rest to a speed of v, doing 5,130 j of work in the process. during this time, the car moves 21.0 m. neglecting friction between car and road, find v and the horizontal force exerted on the car.

Anika asks Eva to roll a basketball and then a bowling ball to her. Which requires more force to roll, and why?

Why does a buoyant force act on every object in a fluid? Pressure pushing up on the bottom of the object is greater than the pressure pushing down on the top.