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A student makes some tea. Its temperature is 45 oC when they finish making it. They want to drink some right away. How much ice at 0 oC should they put in a cup containing 0.5 liters of tea to cool it to 3 oC? Assume tea has the same properties as water.
1. A birdbath shoots water from a 0.5 mm diameter opening. The water rises 10 cm above the nozzle.
a. Calculate the speed of the water leaving the opening.
b. The water line going to the birdbath has an inner diameter of inch. Calculate the speed of the water in the water line.
c. How much water does the birdbath use in one hour?
2. A child wanders away from home on a fall day. The temperature overnight is 20 oC. Their skin temperature is 37 oC.
a. Calculate the net rate of heat flow away from their body. Assume their skin has a surface area of 0.9 m2 and an emissivity of 0.97. Ignore the insulating effects of their clothing.
b. At what rate must their metabolism provide energy to keep their body temperature from decreasing?
four masses m1 5.30 kg m2 4.10 kg m3 9.30 kg m4 4.10 kg are hanging from the ceiling as shown. they are connected
A fisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. calculate How fast are the waves traveling
the objective lens of an astronomical telescope has a focal length of 60 cm and the eyepiece has a focal length of 2
Your task in physics lab is to make a microscope from two lenses.One lens has a focal length of 12 {\rm cm} ,the other a focal length of 2.5 {\rm cm} .You plan to use the more powerful lens as the objective, and youwant its image to be 16 {\rm cm}..
A small piece of dust of mass m = 1.2 g travels horizontally through an electric air cleaner in which the electric field is 472 N/C, What is the charge of the dust particle
A 0.200 nm photon collides by a stationary electron. After the collision, the electron moves forward and the photon recoil backward. Discover the momentum and the kinetic energy of the electron.
A 499-m long spaceship passes by an observer at the speed of 2.40x108 m/s. What length does the observer measure for the spaceship?
Block A in the figure weighs 1.60 N and block B weighs 3.10 N. The coefficient of kinetic friction between all surfaces is 0.300. Illustrate what is the friction force on block A?
A rock is kicked off the edge of a cliff 45.0m high with an initial velocity of 10.0m/s in the horizontal direction. How far from the bottom edge of the cliff does it land
toby has two vertical hanging springs one on his left l and the other on his right r. he hangs his left shoe on spring
You are a delivery person for the Fresh Aqua Spring Water Company. Your truck carries 3 pallets. How many full cases of water can you carry on the cart
A charge of +1.00 10-6 C is located 29 cm from a charge of -4.00 10-6 C. What is the magnitude of the force exerted on each charge
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