2) On a summer day, when the temperature outside is 30.0 °C, I hear a 7.50 x 10^2 Hz bell from the
clock tower at URI, which I know is 2300. m away from my house.

a) Calculate the speed of sound in air on this day.

b) Calculate the wavelength of the sound.

c) Calculate how long, before I heard the sound, it had been emitted from the clock tower.

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .

Which of the following are molecules? a. al b. ag c. mgcl2 d. nacl e. c3h8

Objects a and b are visible in the night sky. six months later they are still visible, but object b shows less parallax than object a. which object is closer? a. a b. b c. you would need to wait another six months in order to figure this out. d. you would need to know the objects' angular diameters in order to figure this out.