A train travels 84 kilometers in 1 hours, and then 85 kilometers in 3 hours. What is its average speed?

When you look into a clear pond, a fish may appear to be in a different position than it actually is. What is this caused by? A. diffraction B. dispersion C. refraction D. reflection,

A 20 kg object is floating in space. What is its mass?

A cup has a height of 6.00 inches. How many centimeters is this? (Note: 1 in = 2.54 cm) A. 2.36 cm B. 8.20 cm C. 12.1 cm D. 15.2 cm

A jet with mass m = 5 * 104 kg jet accelerates down the runway for takeoff at 1.9 m/s2. What is the net vertical force on the airplane as it levels off?

In a household electric circuit the following devices are operated - a) 3 bulbs rated 40W for 5 hrs b) A heater rated 1500W for 3hrs c) A fridge rated 400W What is the cost of energy to operate them for 30 days at Rs. 3 per unit?

A moving object can be in equilibrium. Explain.

If gravity puts a force of 3N an object, how much force would it put on an second object that was twice as heavy

Where did the asteroids in the asteroid belt come from?

Your university radio stawon has a 5.0-kw radio transmixer that broadcasts uniformly in all direcwons; listeners within 15 km have reliable recepwon. you want to increase the power to double that range. what should be the new power?

A projectile is thrown upward so that its distance above the ground after t seconds is h (t) equals negative 16 t squared plus 704 t. a) Find the maximum height the object reaches. b) Find the time it takes the object to reach the ground.