Aglass of juice at 20°c was kept in the open. after 30 minutes, the temperature of the juice remained the same. which statement is correct? a) the temperature of the surrounding air was greater than 20°c b) the temperature of the surrounding air was less than 20°c c) the temperature of the juice was equal to the temperature the surrounding air d) the temperature the juice was less than the final temperature of the surrounding air

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?