The housewife pushes a full cart of food, weighing 70 kg, on the floor of the supermarket. The initial speed of the trolley is zero and the acceleration of the trolley is 0.12 m / s2. The coefficient of friction between the wheels of the cart and the floor is 0.008. (a) How much force does the housewife push the cart? (b) How much work does the housewife do on the first 10 m of the road? (c) What is the average strength of the housewife on that journey?​

Calculate the work done by an external agent during an isothermal compression of 1.00 mol of oxygen from a volume of 22.4 l at 10∘c and 1.0 atm pressure to 16.8l

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.