A 21-kg block of iron drops out of the back of a pickup truck traveling at 55 mi/h. The block slides on the horizontal road for 150 m before coming to rest. Assume the block gets 60% of the thermal energy converted from other forms by the friction interaction between the block and the road, and the process happens so quickly that little of the block’s thermal energy escapes as a heat flow to the block’s surroundings.  (a) Use the momentum requirement to determine the friction force on the block. The friction force on the block is ___N (b) By how much does the block’s temperature increase? The temperature increases is ___K

A large block of lead, initially at rest, falls to the ground from a height of h = 0.65 m. The specific heat of lead is c = 130 J/(kg⋅°C). a)Assuming all the block’s kinetic energy at impact goes into increasing its temperature, enter an expression for the block’s temperature increase as a result of its fall, in terms of the defined quantities and the acceleration due to gravity, g.

A rock of mass 0.213 kg falls from rest from a height of 27.4 m into a pail containing 0.420 kg of water. The rock and water have the same initial temperature. The specific heat capacity of the rock is 1820 J/(kg C°). Ignore the heat absorbed by the pail itself, and determine the rise in temperature of the rock and water in Celsius degrees.

A steel block of mass m is given a push so that it initially slides along a horizontal, steel track of mass M with speed v_0. The block and the track have the same specific heat c. After the initial push, the only forces acting on the block are its weight, a normal force from the track, and friction with the track (coefficient of kinetic friction μ_k). The block travels some distance before coming to rest. Both the block and the track are initially at a temperature T_0 and both end up at a temperature T_1 after the block has come to rest. You may assume that no heat leaves the block + track system and the the only source of heat to increase the temperatures is mechanical energy dissipated by friction. Which of the following changes to the given values would lead to the biggest increase in T_1, assuming all other parameters are left unchanged? (You may ignore any effects of thermal expansion.) a. increase v_0 by 20% b. increase μ_k by 50% c. increase both m and M by 15% d. increase…

A 2 kg block of metal with a specific heat of 100 J/kgºC is dropped from rest at a height of 100 m above the ground. If half of the initial potential energy of the block is converted to heat energy in the block as it falls, what is the temperature change of the block?

Consider a 3-m-high, 6-m-wide, and 0.3-m-thick brick wall whose thermal conductivity is k = 0.8 W/m K. On a certain day, the temperatures of the inner and the outer surfaces of the wall are measured to be 14°C and 2°C, respectively. Determine the rate of heat loss through the wall on that day.

A 11.1 kg loose bag of soil falls 15.55 m at a construction site. If all the energy is retained by the soil in the bag in the form of heat, how much its temperature will increase

A 95.0-kg block of ice at 0.00°C breaks off from a glacier, slides along the frictionless ice to the ground from a height of 2.43 m, and then slides along a horizontal surface consisting of gravel and dirt. Find how much of the mass of the ice is melted by the friction with the rough surface, assuming 75.0% of the internal energy generated stays in the ice. Latent heat of fusion (Lf) for water 333,700 J/kg.

A certain sandwich cookie contains 55 CC of nutritional energy. For what amount of time must you swim in order to work off three cookies if swimming consumes 510 C/hC/h AND Instead of swimming you decide to run for 40 min at a pace that works off 860 C/hC/h. How many cookies have you worked off?

Consider nitrogen gas in a container at temperature T= 225 K. A molecule's average kinetic energy is Kayg = kRT. Calculate the momentum magnitude p of a nitrogen molecule having this kinetic energy. The momentum magnitude p of the nitrogen molecule is kg · m/s . aw MacBook Pro G Search or type URL @ # $ % & 2 3 4 5 7 8. W E Y D F G J K C V M B