A cheetah is crouched 20 m to the east of an observer (Fig. 2.6a). At time the cheetah begins to run due east toward an antelope that is 50 m to the east of the observer. During the first 2.0 s of the attack, the cheetah’s coordinate x varies with time according to the equation (a) Find the cheetah’s displacement between and (b) Find its average velocity during that interval. (c) Find its instantaneous velocity at by taking then then (d) ¢t = 0.1 s, 0.01 s, 0.001 s. Derive an t1 = 1.0 s t t 2 = 2.0 s. 1 = 1.0 s 15.0 m>s2 2t 2 x = 20 m + . t = 0 expression for the cheetah’s instantaneous velocity as a function of time, and use it to find at t=1.0s and t=2.0s

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same

The weights of bags filled by a machine are normally distributed with a standard deviation of 0.05 kilograms and a mean that can be set by the operator. at what level should the mean weight be set if it required that only 1% of the bags weigh less than 9.5 kilograms? round the answer to 2 decimal places.

According to rutherford's nuclear theory, most of the volume of an atom is , so the volume of a hydrogen atom cannot be mostly due to the proton.according to rutherford's nuclear theory, the core of an atom (nucleus) contains most of of an atom and is , so the majority of the mass of a fluorine atom cannot be due to its nine electrons.according to rutherford's nuclear theory, the number of negatively charged particles outside the nucleus the number of positively charged particles within the nucleus, so a nitrogen atom has 7 protons and 7 electrons, while a phosphorous atom cannot have 15 protons and 150 electrons.word bank: dense, empty space, more than, mass, particles, the same as, less than, positively charged, negatively charged